English: Product Description: Material: Plastic Color: Blue Size: 140*20*15mm Cellular carrier frequency: 2402MHz-2480MHz Wireless working channels: 16, automatic frequency hopping Rated working voltage: 3V Rated working current: 15mA Power supply mode: battery *1 AAA battery (without battery) Specifications: 2.4G wireless mouse, transmission distance 10 meters 3-speed CPI adjustment: 800/1200/1600 Micro wireless receiver Support system Windows 7/8/10/Vista/XP/2000, Android, Linux, Mac OS. Package Contents: 1 * Mouse Stylus Pen 1 * USB Receiver Ultra-Portable: 2.4G wireless optical mouse, mini size, just like a pen. Fits in your pocket, take it to class, a meeting and anywhere on the go. You can use a wireless mouse anywhere you want. Adjustable CPI: 800, 1200, 1600 DPI level adjustment - 500/1000, help you find the right "speed". The grip is very natural and you can place your arm close to your body or even against your body for extra comfort. Power Saving: With USB receiver, up to 10m effective distance. Powered by one AAA battery (not included), plug and play. Auto sleep function, don't worry about wasting your battery. Ergonomic Design: Fits comfortably in your hand, pen shape, perfect for handwriting and graphic design. Best Gift: A perfect gift for teachers, professors, classmates, colleagues, friends and leaders.