The ASUS ROG Keris II Ace is a wireless gaming mouse built for right-handed FPS players who want an ultralight feel without giving up control. Rather than chasing the smallest possible shell, ASUS leans into a compact ergonomic shape that feels immediately planted in hand, especially during steady tracking and small aim corrections in games like Counter-Strike 2 and Valorant.

The short version: it’s a premium, pro-leaning ergo that prioritizes aim feel and responsiveness over extra buttons and “productivity” extras.

At 54 g, the weight hits a sweet spot: light enough for quick starts and stops, but not so minimal that the mouse feels nervous or unstable. The ergonomic right-hand contour adds a sense of guidance that many ambidextrous ultralights lack, which helps during long sessions where consistency matters more than raw speed.

Performance & feel

The AimPoint Pro sensor is firmly in flagship territory and includes track-on-glass support, so surface choice is less likely to throw off your aim. In practice, tracking feels consistent and predictable, whether you’re making small corrections while holding angles or following fast-moving targets. The optical main switches deliver crisp, uniform clicks that avoid double-click quirks and feel especially reliable for burst firing and tap shots.

Glide and balance are tuned for competitive play rather than experimentation. Once you dial in your DPI and polling settings, this is the kind of mouse you stop thinking about mid-match—which is exactly what many FPS players want.

Connectivity & everyday use

Unlike many esports-focused ultralights, the Keris II Ace keeps some daily-driver flexibility. Tri-mode connectivity (2.4 GHz wireless, Bluetooth, and USB-C wired) plus Omni Receiver support make it easy to move between a main gaming PC and a laptop without juggling multiple dongles. That versatility is a genuine bonus if your setup isn’t single-purpose.

One caveat is polling rate management. To run the highest polling modes, you’ll rely on the included Polling Rate Booster, which adds a second dongle to your desk. It works as intended, but it’s one more component to manage—and battery life will drop faster if you keep polling and RGB maxed out.

What this mouse is—and isn’t

This is an esports-first tool. You get two side buttons, a clean top shell, and very little in the way of extras or customization beyond performance tuning. If you rely on lots of binds for MMOs, productivity workflows, or creative apps, it will feel under-equipped.

If you like the idea of an aim-focused ultralight but prefer a larger, more traditional palm-filling shape, the Razer DeathAdder V3 Pro is a better fit. Players who want more size options and similar weight targets can also look at the Pulsar Xlite V3 ES lineup.

Bottom line: the Keris II Ace does exactly what it sets out to do. It’s an aim-first ultralight ergonomic mouse that rewards disciplined FPS play, as long as you’re comfortable with a minimalist button layout and the booster-based path to its highest polling rates.