Main features:1. Rechargeable Ergonomic Design Wireless Mouse -- Reduce Tension - The ergonomic design keeps the wrist and forearm in a true 45-degree "handshake" position, preventing wrist strain caused by long-term use. The skin material is lightweight and feels good in hand. It does take some getting used to using the mouse at different angles. Once you get used to it, you'll absolutely love it! [Not compatible with Mac operating system] [Please confirm size and system before purchasing]2. High-capacity battery rechargeable mouse -- built-in rechargeable battery. No need to buy batteries anymore, very convenient! ! Charging quick connect design allows you to switch from wireless to charging cable connection so you never run out of power. (A 2.4G USB receiver needs to be plugged into the device) [Note: If the vertical mouse does not work smoothly, please check whether the battery is dead, because insufficient battery power will affect performance]3. Multifunctional and convenient - Advanced "Back" and "Forward" function buttons provide convenience for web browsing. 800/1200/1600 DPI levels - easily adjust mouse sensitivity4. Widely compatible -- Widely compatible with Windows 2000/XP/Vista/7/8/10/Linux. [Note: Not compatible with Mac OS, Apple products] Once you get used to the ergonomic mouse, you'll really like it!5. Excellent Customer Service -- Rest assured, all of our Lekvey Ergonomic Vertical Mouse are backed by an unconditional 24-month product warranty (replacement or refund) and lifetime easy-to-access technical supportSpecificationDimensions (length, width and height): 105*73*60 (mm)Working range: >15mTransmitting power: +5db maxWorking voltage: 3.7VComputer system requirements:Windows 2000Windows XPWindows Vista, Windows CE, Windows 7, Windows 8, Windows 10Linux, AndroidPackage Contents:A Lekvey vertical ergonomic optical mouse2.4G USB Receiver1 charging cable1 piece User Manual