Quiet & Stylish Design: All keys on this wireless keyboard feature low-profile scissor switches, resulting in an ultra-slim (2mm key travel), responsive, and quieter typing experience. The portable mouse also boasts new silent click buttons for noise-free operation. The keyboard and mouse offer a quiet and modern look for your desk, ideal for presentations, conferences, libraries, cafes, nighttime work, and travel. High-Precision 5-Level 2400 DPI: Easily adjust the cursor sensitivity of this wireless mouse to suit your activities; 1600 DPI for desktop computers, 2000-2400 DPI for 4K screens or gaming. Two refresh rates: 125Hz and 25Hz; adjustable by simultaneously pressing the right button and wheel for 3 seconds. Convenient & Fast: Enjoy quick access with the numeric keypad and multimedia hotkeys. (Hotkeys may not be fully compatible with Mac systems). This wireless keyboard and mouse use a single nano receiver to connect to the USB port of your computer or laptop. The nano receiver is stored in the mouse next to the battery compartment. Ergonomic Design: The keyboard features a tilted design for optimal typing posture. The soft, sweat-resistant coating and contoured wireless mouse allow for comfortable use for hours. Long-Lasting Battery (Batteries Not Included): The optical mouse operates at only 0.11 mA and automatically enters power-saving mode after 20 seconds of inactivity; easily reactivated by clicking. The compact keyboard also deactivates after 8 minutes of inactivity. 3 AA alkaline batteries are not included.