Mobile operations are more relaxed than ordinary mice, small base, place does not take up space. Human body handwritten design is more suitable for hand grip, comfortable to use when sitting at different angles, not tired. Plug and play, without driving; Exquisite and small, notebook users preferred. With On/Off switch; 2.4ghz wireless transmission effective distance up to 10 meters. Handwritten input, can be used on a narrow desktop; Humanized key position design, grasp very convenient. Specification: Keys quantity: 4 keys DPI: 800/1200/1600dpi Current: 3V 15mA RF frequency: 2402 MHz - 2480 MHz Power supply: 1xAAA battery (NOT Included) Material: ABS Application: PC, smart TV Support Windows 2000/XP/Vista/7, for Android, for MAC OS etc. Size: 14x2x1.5cm/5.5x0.78x0.59inch Weight: 29g Package Includes: 1 X Pen Mouse 1 X USB 2.4GHz Receiver 1 X Mount 1 X Instructions Note: Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!