The Asus ROG Keris II Ace is an ultra-light gaming mouse designed for precision and speed, capable of reaching a maximum resolution of 42,000 DPI and an interrogation frequency of 8,000 Hz, whether used via a wired or wireless connection. This second generation of the Keris series introduces a new optical sensor, adds wireless connectivity, and significantly reduces the mouse's size and weight. The result is a lightweight design that directly competes with Razer’s DeathAdder, a well-known ultra-light mouse. Both models are priced around 150 € and are tailored for right-handed users with similar ergonomic shapes. The Keris II Ace’s dimensions are carefully optimized to achieve a weight of 54 grams—comparable to the Viper V3 Pro but slightly heavier than Razer’s lighter V4 Pro. Its body features a slightly rough plastic finish that resists sweat and oil, with textured areas on the sides to improve grip. However, these textures can collect dirt and are harder to clean. The mouse uses optical switches for its main buttons, which offer longer life and more precision compared to traditional mechanical switches. However, they may feel less responsive and require some time to get used to. The left click has a slightly longer travel distance to compensate for height differences and reduce accidental presses. The side buttons and scroll wheel are designed for deliberate use, requiring the tip of the thumb for activation. The scroll wheel has grooves that allow for precise or fast scrolling, depending on the situation. However, the rubber coating on the scroll wheel is prone to dust and feels a bit cheap. The mouse includes a mechanical encoder from TTC Gold, a reliable component in the gaming peripheral industry, and features RGB lighting that is visible through a transparent cover. Connectivity options include a 2.4 GHz radio dongle, a USB-A extension cable, and Bluetooth, offering versatility not commonly found in gaming mice. While the Keris II Ace is highly optimized for performance and lightness, it is not ideal for users with larger hands due to its compact size. It is designed for right-handed users and offers a comfortable grip in both claw and palm styles. However, the software experience is somewhat fragmented, requiring two separate applications—Armoury Crate and Armoury Crate Gear—for different functions, which can be inconvenient. Despite these issues, the mouse offers high sensitivity, fast interrogation rates, and good tracking performance, making it a solid option in its price range, though it trails behind the latest Razer models in some areas.