GravaStar Mercury M2 Review: PAW3395 Sensor in a 79g Wireless Shell

DPI numbers on gaming mice are basically the megapixel wars of the camera world. Remember when phone makers were slapping 108MP on budget handsets and everyone lost their minds? Same energy. GravaStar is listing 26,000 DPI on the Mercury M2 box, which sounds impressive until you realise most competitive players run 800 to 1600 DPI and would never touch anything above that. The number that actually matters here is the sensor model: PAW3395. That's a PixArt chip that's earned genuine respect across the enthusiast community, and it tells you far more about what this mouse can do than any headline DPI figure ever will.

So why are we even looking at the GravaStar Mercury M2? Because the wireless ultralight market is absolutely rammed right now, and picking the wrong one is genuinely annoying. You end up with something that either feels like a bar of soap, has side buttons in the wrong place, or costs a fortune for marginal gains. The M2 sits in an interesting spot: it's got a proper sensor, comes in at 79g, uses a hollowed-out shell (which either looks brilliant or ridiculous depending on your taste), and has racked up 1,228 owner reviews averaging 4.5 stars. That's not a fluke. Worth a proper look.

The owner review pool here is large enough to be meaningful. When you've got over a thousand people reporting back, patterns emerge fast. The praise clusters around the sensor, the weight, and the wireless reliability. The complaints, where they exist, are more specific and we'll get into those. But the headline is: this is a mouse that's doing most things right for its price bracket, and the spec sheet backs that up before you even open the box.

Connection options cover 2.4GHz wireless via a USB-A dongle and Bluetooth, plus a wired USB-C mode if you want to play plugged in or just charge while gaming. Five programmable buttons is standard for this class, and the five-zone RGB lighting is there if you want it (and eats into battery life if you do). The hollowed-out shell design is the visual talking point, giving it that distinctive GravaStar look that's very much a love-it-or-leave-it aesthetic. Structurally it also helps keep that weight down without going full honeycomb like a Glorious Model O.

The switch type isn't explicitly called out as optical or mechanical in the official listing, which is mildly frustrating. Based on owner reports and GravaStar's product positioning, these are mechanical switches rather than optical. That matters for click feel and longevity, and we'll cover it properly in the buttons section. What's confirmed is the 5 programmable buttons, on-board memory for profiles, and support for both Mac and Windows. USB-C charging is a genuine quality-of-life win over older micro-USB designs that still haunt some competitors.

For claw grip players, this shape is quite comfortable. Your fingers naturally arch over the main buttons, the side buttons sit in a reachable spot without being so close that you accidentally press them, and the overall width feels manageable without being cramped. Fingertip grip users with medium hands will also get on well here. The hollowed-out sections of the shell don't interfere with grip in any meaningful way during normal use, though a small number of owners have mentioned the cutouts can feel slightly sharp at the edges depending on how you hold it. Worth knowing if you have sensitive fingertips.

Dimensions aren't officially published in full detail by GravaStar, which is a minor annoyance for those of us who like to compare length, width, and height before buying. From owner reports and product images, it reads as a medium-sized mouse, probably around 120mm to 125mm long and 60mm to 65mm wide. That puts it in a comfortable range for most adult hands without going full compact. The symmetrical design also means the side buttons are only on the left side, so left-handed players technically can use the mouse but won't have thumb buttons unless they remap something creative. Worth flagging.

The 26,000 DPI ceiling is pure marketing, full stop. If you're using this mouse at anything above 3200 DPI you're either playing on a massive 4K display with a tiny mousepad or you've misunderstood what DPI does. The sweet spot for most FPS players is 800 to 1600 DPI, and the PAW3395 is flawlessly accurate across that entire range. The sensor also handles very slow tracking without stuttering, which is something cheaper sensors can struggle with when you're doing precise micro-adjustments. Owner reviews consistently mention smooth, accurate tracking, and that aligns exactly with what the PAW3395's spec sheet predicts.

Lift-off distance on the PAW3395 is configurable in software, but the default is low enough that it won't cause problems for low-sensitivity players who lift and reposition frequently. This is one of those things that sounds trivial until you've used a mouse with a high lift-off distance and watched your cursor drift every time you pick it up. The M2 doesn't have that problem. At 1000Hz polling rate over 2.4GHz, the motion data is hitting your PC 1000 times per second, which is more than fast enough that wireless latency simply isn't a factor in practice. The optical tracking technology here is doing exactly what it should: getting out of your way and letting you aim.

Weight distribution is where things get slightly less clear-cut. Without official front-to-back balance data, we're relying on owner reports, and the consensus is that the M2 feels reasonably well balanced without any noticeable nose-heaviness or tail-heaviness. A handful of owners have noted it feels slightly front-heavy compared to mice with the battery positioned further back, but this is a minor observation rather than a consistent complaint. For most grip styles and use cases, 79g with decent balance is a genuinely comfortable combination for extended gaming.

The mouse feet (skates) are PTFE, which is the right material. The question is always about the quality of the PTFE and whether the edges are rounded or sharp. Sharp-edged skates catch on mousepad fibres and create a scratchy, inconsistent glide feel that's immediately noticeable. Owner reports on the M2's skates are mostly positive, with smooth glide on both cloth and hard pads mentioned repeatedly. A small number of owners have replaced the skates with aftermarket options as a matter of habit rather than necessity, which is actually a decent sign: if the stock skates were genuinely bad, you'd see consistent complaints rather than enthusiast upgrades. The 1000Hz polling rate ensures the motion data keeps pace with even fast flicks without any smoothing artefacts.

Pre-travel on the main buttons appears minimal based on owner feedback. You want the click to register as soon as you press, not after the button has travelled halfway to the bottom of its travel. Post-travel (the distance after the click registers) is also reported as tight. Together this gives a snappy, responsive feel that holds up well in rapid-fire clicking scenarios like Minecraft PvP or fast-paced FPS games where you're clicking constantly. The side buttons sit on the left flank in the standard thumb-button position, and their placement gets positive marks from owners for being easy to reach without being accidentally activated during normal grip.

The scroll wheel is a standard notched encoder design rather than a free-spinning wheel. For gaming, notched is generally preferred because it gives you tactile feedback for weapon switching without the wheel running away from you. The notch feel is described as satisfying rather than mushy in owner reports, which is what you want. The DPI button sits on the underside of the mouse rather than on the top shell, which is a design choice that keeps the top surface clean but means you can't change DPI on the fly without picking the mouse up. For most players who set their DPI once and leave it, this is fine. If you cycle DPI regularly during play, it's worth knowing.

Button wobble is minimal according to owner feedback. Excessive side-to-side play in the main buttons is another thing that sounds minor until you experience it, at which point it becomes immediately irritating. The M2's main buttons sit flush and move cleanly without lateral slop. The overall fit and finish of the shell gets described as premium-looking in several owner reviews, which aligns with GravaStar's brand positioning as a company that leans into visual design. The matte finish on the shell resists fingerprints reasonably well and doesn't feel slippery, which matters when your hands are warm after a long session.

One area that gets occasional mentions in owner reviews is the RGB diffusion through the cutouts. The hollowed sections let light through in a way that creates a distinctive effect, but a small number of owners have noted uneven lighting in certain zones. This is largely a cosmetic issue rather than a functional one, but if RGB uniformity is important to you it's worth knowing. More meaningfully, a handful of owners mention the USB-C port feels slightly loose after extended use. This isn't a widespread complaint and might reflect individual unit variation, but it's the kind of thing that's worth monitoring over time. USB-C is still the right connector choice over micro-USB regardless.

Bluetooth is there for productivity use and laptop connectivity where you don't want to use up a USB port on the receiver. It's not the mode you'd choose for competitive gaming because Bluetooth polling rates are lower and latency is higher, but for general desktop work it's perfectly fine. The ability to switch between devices is a nice feature for people who use the same mouse across a gaming PC and a work laptop. The nano receiver storage situation isn't explicitly documented in GravaStar's listing, which is a minor oversight. Some owners mention storing the dongle in the mouse itself, suggesting there may be a compartment, but this isn't confirmed clearly enough to state as fact.

The USB-C wired mode gives you a fully functional wired connection for charging while playing or for the rare situation where you want zero wireless overhead. The cable quality isn't described in detail by GravaStar, but owners who've used the wired mode describe it as functional without notable drag issues. For most users the wired mode will be a charging cable rather than a primary connection method, and that's fine. The USB-C standard means you can use any compatible cable if the included one gets lost or damaged, which is a practical advantage over proprietary connectors.

Charging is via USB-C, which means fast charging support is at least theoretically available depending on the charger you use. Charge time from flat isn't officially specified, but owner reports suggest it's in the two to three hour range for a full charge, which is reasonable. The mouse is usable in wired mode during charging, so you're never stuck waiting for it to charge before you can play. That's a genuinely useful feature and one that some competitors still don't offer properly.

Battery life complaints are essentially absent from the owner review pool, which is telling. When a mouse has battery issues, owners talk about it loudly. The M2's battery performance appears to match or exceed expectations across the board. The one thing to watch is that RGB lighting on five zones can be surprisingly hungry, so if you notice battery life dropping faster than expected, dimming or disabling the RGB is the first thing to try. On-board memory means your lighting settings are saved without needing software running in the background, which is a small but appreciated detail.

DPI stages are configurable across multiple steps, with the PAW3395 supporting settings from very low (useful for sniper scopes) up to the 26,000 ceiling (useful for nothing practical). The polling rate options cover 125Hz, 250Hz, 500Hz, and 1000Hz. Stick to 1000Hz for gaming. The lower options exist for compatibility with older systems or to extend battery life marginally. On-board memory stores your profiles directly on the mouse, which means your settings travel with the mouse without needing software installed on every PC you use. This is proper and expected at this price point.

Macro support covers the programmable buttons, so you can assign complex inputs to the side buttons or DPI button if you're playing games that benefit from it. MMO players will note there are only five buttons total, so this isn't a macro powerhouse. For FPS and general gaming the five-button layout is fine. Firmware updates are handled through the software, and GravaStar has pushed updates post-launch based on owner feedback, which is a positive sign for ongoing support. The RGB customisation covers the five lighting zones independently, with a range of effects including static, breathing, and reactive modes.

For battle royale and tactical shooters where you're playing longer sessions, the weight becomes even more relevant. Fatigue from a heavy mouse over a two-hour session is real, and at 79g the M2 doesn't cause that. The symmetrical shape means you can shift your grip slightly without the mouse fighting you, which some players do unconsciously during long sessions. The main click feel, described as crisp and tactile, holds up well during rapid-fire moments without feeling like the switches are struggling. No reports of missed clicks or double-click misfires at scale in the owner review pool.

For MMO or MOBA players, five buttons is on the low end. You've got left click, right click, scroll wheel click, and two side buttons. That's workable for most games but won't satisfy players who've built muscle memory around eight or twelve thumb buttons. The M2 is clearly aimed at FPS and general gaming rather than the MMO niche. Casual and productivity users will find it comfortable for extended desktop use too, with the Bluetooth mode making it easy to use across multiple devices. The RGB is genuinely nice-looking through the cutouts if you care about that sort of thing, and the 4.5-star average across suggests most buyers are happy with the overall package.

Against the G305, the M2 wins on sensor (PAW3395 is more capable than the HERO 12K in the G305), loses slightly on software polish, and is broadly comparable on wireless reliability. The M2's hollowed-out design is more visually distinctive and the RGB is more elaborate, though neither of those things affect performance. Weight is similar between the two. For pure gaming performance, the M2's sensor advantage is real but not transformative for most players. The G305's software ecosystem and brand trust are genuine advantages for buyers who value that.

Against the DeathAdder V3 HyperSpeed, the M2 wins on symmetrical design (broader user base), loses on ergonomic shape refinement (the DeathAdder's right-handed shape is genuinely excellent for palm grip), and is comparable on wireless performance. The DeathAdder's Focus X sensor is competent but a step below the PAW3395 in raw specification. Price positioning varies by retailer and promotion, so check current prices before deciding. The M2 holds its own in this comparison and offers a genuinely different aesthetic that some buyers will actively prefer.

One thing the comparison table makes obvious: the G305's battery life advantage is partly because it runs on a AA battery rather than a built-in rechargeable. Some people love that (never worry about charging, just swap the battery), others find it adds weight and inconvenience. The M2's USB-C rechargeable approach is the modern standard and most buyers in 2024 will prefer it. The DeathAdder V3 HyperSpeed's 300-hour battery life with no RGB is impressive, but that mouse doesn't have RGB to drain it either.

The complaints that do appear are worth taking seriously even if they're minority reports. The software gets mentioned as less intuitive than Logitech or Razer equivalents, which is fair criticism. A small number of owners mention the side button placement being slightly awkward for their hand size, which is always a personal fit issue rather than a universal flaw. The occasional mention of the USB-C port feeling slightly loose after extended use is the one hardware concern worth watching. And a handful of buyers mention the RGB being less uniform than they expected through the cutouts, which is a cosmetic issue but worth knowing if RGB quality is a priority for you.

The pattern that stands out most in the positive reviews is buyers who specifically came from heavier or wired mice and found the M2's combination of wireless freedom and low weight to be a meaningful upgrade to their experience. That's the mouse doing exactly what it's supposed to do. The negative reviews that mention returns or defects are present but in line with normal rates for consumer electronics. No widespread quality control failures appear in the review data, which at you'd expect to see clearly if they existed.

The PAW3395 sensor at this price is the core value argument. You're getting a sensor that appears in mice costing significantly more, in a package that includes proper wireless, USB-C charging, and a distinctive design. For buyers who care about sensor quality but don't want to pay flagship prices, the M2 makes a strong case. The five-button layout and solid build quality round out a package that covers the basics competently without obvious corners cut.

Where the value case weakens slightly is software. If you're someone who tweaks profiles constantly, runs complex macros, or wants deep RGB customisation with a polished interface, GravaStar's software isn't at the level of Logitech or Razer. But if you set your DPI and polling rate once, save them to on-board memory, and get on with gaming, the software limitation is largely irrelevant to your daily experience. For that majority of users, the M2 represents genuinely good value in its price bracket.

• Software polish: not at Logitech or Razer's level
• Switch type unspecified: mechanical but manufacturer not named
• RGB battery drain: no published figure for RGB-on battery life
• USB-C port durability: occasional reports of looseness over time
• Five buttons only: not enough for MMO players
• Shape dimensions unpublished: harder to assess fit without trying

The nano receiver is small enough to lose, which is the universal problem with all nano receivers. GravaStar doesn't make a big deal of receiver storage in their marketing, so if there's a compartment in the mouse for it, it's not prominently featured. Keep the receiver somewhere sensible when not in use. Losing it means buying a replacement, and proprietary receivers from smaller brands can be harder to source than Logitech's universal Unifying receiver.

Wireless range isn't officially specified but owner reports suggest it's solid across normal desk and room distances. No dropouts reported at typical gaming distances. The 2.4GHz band can experience interference in environments with many competing devices (busy offices, crowded Wi-Fi environments), but this is true of all 2.4GHz wireless mice and the M2 doesn't appear to be more susceptible than average. For home gaming setups, it's a non-issue.

USB-C charging is the right call and it's good to see it here. The ability to play while charging means a dead battery is never a session-ending problem. Plug it in, keep playing in wired mode, unplug when charged. Simple. The charge time of roughly two to three hours from flat is standard for this battery size and not a concern.

If you run RGB at full brightness constantly, expect that 80-hour figure to drop substantially. Five RGB zones burning at full intensity will hit the battery harder than a single logo LED. Dimming the RGB to 50 percent brightness is a reasonable compromise that preserves the visual effect while meaningfully extending runtime. The software lets you configure this, and on-board memory stores the setting so you don't have to reconfigure every time.

The on-board memory is the feature that makes the software limitation largely irrelevant for most users. Set your DPI to 1600, set your polling rate to 1000Hz, save it to the mouse, and close the software. The mouse will remember those settings forever without needing the app running. You only need to open the software again if you want to change something. That's the right design philosophy for a gaming mouse and GravaStar has implemented it correctly.

Macro support works across the programmable buttons and covers basic to intermediate complexity. If you're a hardcore macro user who needs complex conditional sequences, you'll probably find the software limiting. For standard gaming macros (push-to-talk, grenade bind, whatever), it handles the job. Firmware updates through the software have been used to address user feedback post-launch, which is a positive signal that GravaStar is actively maintaining the product rather than shipping and abandoning it.

What the M2 has that most competitors at similar price points don't is the combination of PAW3395 sensor, Bluetooth connectivity, and the distinctive visual design. If aesthetics matter to you and you want a mouse that looks different from the sea of matte-black gaming peripherals, the M2 stands out. That's not nothing. Peripheral choices are personal, and if you're going to stare at something on your desk for hours every day, liking how it looks is a legitimate factor.

The bottom line on comparisons: the M2 is competitive on the specs that matter (sensor, weight, wireless), slightly behind on software, and ahead on visual design. It's not the best mouse in any single category, but it's a solid all-rounder that doesn't have an obvious fatal flaw. For its price bracket, that's a genuinely good result.

Who should buy it? FPS and general gamers with medium hands who use claw or fingertip grip, want wireless freedom without paying flagship prices, and appreciate a mouse that looks distinctive on the desk. Left-handed players can use it (symmetrical shape) but won't have thumb buttons on the right side. Players who want a polished software experience or who need more than five buttons should look elsewhere. MMO players specifically should skip this and look at mice with more programmable buttons.

Who should skip it? Palm grip players with large hands might find the shape slightly short on rear support. Software-heavy users who want the Logitech or Razer ecosystem experience will find GravaStar's app a step down. And if you're the kind of person who needs every component specified by manufacturer (switch brand, skate material grade), GravaStar's marketing leaves some gaps that might bother you. But for the majority of gamers who want a lightweight wireless mouse with a proper sensor and don't want to pay premium brand prices? The Mercury M2 is worth serious consideration.

Score: 8 out of 10. Loses a point for software polish and another for the gaps in published specifications. Gains those back almost entirely from the PAW3395 sensor, the weight, and the triple connectivity package. A solid mouse from a brand that's clearly put thought into the things that actually matter.

For right-handed palm grip players specifically, the Razer DeathAdder V3 HyperSpeed offers one of the most ergonomically refined shapes in the market, lightweight wireless, and Razer Synapse's mature software. The shape is right-handed only, but if that's you, it's a very comfortable mouse for long sessions.

If you want to stay in a similar price bracket and prioritise even lower weight, the Pulsar X2 Wireless is worth comparing directly. Similar sensor tier, symmetrical shape, and a weight that dips slightly lower than the M2. Software is also a mixed bag with Pulsar, so you're not trading up there, but the core mouse performance is competitive. Check current pricing on all three before deciding, as the wireless mouse market moves quickly and deals appear regularly.