Introducing BigBunny: The 49-Gram Mouse That Takes Aim at the FPS Elite

Competitive shooters have spent the last five years in a weight war. Logitech’s G Pro X Superlight sits at 63 grams, Razer’s Viper V2 Pro lands at 58, and most serious players accept the 60-gram range as a practical floor. Introducing BigBunny upends that assumption with its first product, the Swift, a wireless mouse that weighs exactly 49 grams and does it without a single honeycomb hole in the outer shell. The company arrives with a rabbit logo and an engineering story that feels more like a physics project than a lifestyle brand, and the timing is no accident. BigBunny spent three years iterating on the Swift before showing it to a single reviewer or esports team, which is unusual in a market where brands announce roadmaps before shipping a finished unit.

The weight story starts with materials. The Swift uses a magnesium alloy exoskeleton paired with an internal lattice structure that eliminates unnecessary plastic without exposing anything to dust and grime. The shell thickness measures 0.8 mm in high-stress zones and 0.6 mm around the button housings, compared to the 1.5 mm average of a standard ABS mouse. When you squeeze the shell, it does not flex or creak. When you flick it across a hard pad, the mouse stops with a clean, controlled feel instead of a hollow rattle. The surface is a fine matte texture that grips sweaty fingers, and there is no RGB lighting anywhere on the chassis. BigBunny designers removed the LEDs entirely and repurposed that board space for a larger battery connector, a decision that tells you exactly who this product is for.

Sensor and Playback Performance

Inside the Swift sits the BigBunny BB-01 optical sensor, which caps out at 26,000 CPI with a 650 IPS tracking speed and 50G acceleration. Those headline numbers mean less than the firmware tuning around them. The sensor natively polls at 4,000 Hz, not as a paid unlock, reporting position to your PC every 0.25 ms. On a 240 Hz monitor, the difference between the Swift and a standard 1,000 Hz mouse translates to roughly 1.2 ms of average input latency, enough to feel in an aim trainer like KovaaK’s where a single mistracked flick ruins a run. The TrueMove-style motion sync is handled through a dedicated low-pass filter that you can toggle in software, and the default setting favors responsiveness over smoothing.

Battery life is the usual objection to any ultra-light mouse, and the Swift answers it with a 250 mAh cell that delivers 90 hours at 1,000 Hz, 60 hours at 2,000 Hz, and 35 hours at 4,000 Hz. The 90-hour figure beats the Viper V2 Pro’s 80 hours and trails the Superlight 2 by just five hours, but the Swift charges to 50% in 12 minutes over USB-C. In practical terms, you can top up during a 30-minute break between scrims and finish a full tournament day. A power-saving mode drops the polling rate to 500 Hz and extends the battery past 140 hours, but the swipe-to-wake latency rises to 4 ms, so most players will leave it off.

Shape, Buttons, and Skates

Shape makes or breaks a gaming mouse, and BigBunny openly targeted the claw and fingertip crowd. The Swift uses a symmetric silhouette with a lowered front slope; the button height sits at 1.1 cm at the click point, 4 mm lower than the Viper V2 Pro. That angle rolls your palm slightly forward and keeps your knuckles from dragging on the pad. The hump peaks at 3.9 cm and sits closer to the rear than on the Superlight, which gives neutral clearance for medium hands in the 17.5 to 19 cm range. If you palm grip with a hand larger than 20 cm, this mouse will feel short, and BigBunny says that is intentional. The first design target was the common pro claw grip, and the second was fingertip players who need a low button height for precise micro-adjustments.

The main switches use optical mechanisms rated for 90 million clicks with a pre-travel of 0.2 mm and no measurable post-travel variance. The scroll wheel runs on a notched ALPS encoder with 24 detents per rotation, which steps clearly enough for weapon swaps in CS2 but stays quiet for browsing. Side buttons sit recessed into the shell to avoid accidental presses during intense lifts, and they require 70 grams of force to activate. The stock skates are 100% PTFE at 0.85 mm thickness, covering about 18% more base area than the Superlight’s set. On a glass pad, the coefficient of friction measures 0.09, so the mouse glides with minimal initial push force and stops predictably when you apply pressure.

Software That Stays Out of the Way

BigBunny’s companion app, called BigBunny Hub, installs in about 1.2 seconds and uses 48 MB of RAM while running. Profiles store directly on the mouse’s 512 KB onboard memory, so you can plug the Swift into a tournament PC and skip the admin-rights headache entirely. There is no mandatory cloud account, no telemetry toggle buried in a legal menu, and no bloatware modules for lighting themes or app integrations. You can adjust DPI steps, polling rate, debounce time, and angle snapping in a single window, and the app does not push firmware updates without a manual confirm. BigBunny has committed to four years of firmware support in writing, which is a longer guarantee than most peripheral brands offer.

Price and Positioning

The Swift launches at $119, which undercuts the Superlight 2 by about $40 and the Viper V2 Pro by $10. A white version and a 4K USB-C dongle ship at the same price. BigBunny’s first production run is 50,000 units, and the company has been unusually transparent about why: they are testing panel quality across three factories before committing to a permanent assembly line. Pre-production measurements showed a weight variance of just 0.3 g across three samples, well inside the 1 g tolerance most brands claim but rarely deliver. The mouse also includes a braided USB-C cable, a set of replacement skates in the box, and a carrying case that holds the dongle and a small microfiber cloth.

Introducing BigBunny is not about a cute rabbit logo stitched onto a generic shell. It is a deliberately engineered product for a specific player profile: medium hands, claw or fingertip grip, sub-50-gram weight requirement, and no tolerance for input delay. The absence of RGB, the aggressive weight target, and the honest pricing all point to a company that did its homework and respects the competitive scene. The real test comes with the second product, which BigBunny says will address ergonomic shapes for larger hands and a lightweight wired budget option. For now, the Swift sets a precise benchmark that costlier rivals will have to answer.