Description: Ergonomic Design: Vertical optical mouse, less effort for the arm/wrist/hand. Left / right, forward / backward, DPI, scroll wheel 6 buttons provide extra convenience. ( Page Up / Down Buttons, Forward / Backward Buttons do not work for OS ) 4 Level DPI: 4 level adjustable 800/1200/2400/3200 DPI, meets the needs of working and most of the games. Optical Tracking Technology ensures greater sensitivity. Wide Compatibility: Support for Windows 2000 / for Windows XP / for Windows 7 / for Windows Vista / for Windows 98 / for OS / for Windows ME / for Windows 8 / for Windows 10, etc. Plug and play, no driver required. Function: With low voltage alarm function and sleep function, 3-5 minutes for normal sleep, shake the mouse to wake up; 8-10 minutes for deep sleep, press the left and right keys to wake up. Application: Suitable for computers, laptops, desktops, etc. Perfect choice for home, office or gaming. Specification: Product size: 14cmx7.5cmx8cm/5.51inchx2.95inchx3.15inch Material: Plastic Package Includes: Optional: USB Wired Version: 1 Vertical Mouse or 2.4G Wireless Battery Version: 1 Vertical Mouse 1 2.4G Receiver or 2.4G Wireless Rechargeable Version: 1 Vertical Mouse 1 2.4G Receiver 1 USB Cable Note: Note: 1. The 2.4G Wireless Battery Version needs 1 AA Battery. (Not Included) 2. The 2.4G Wireless Rechargeable Version Battery Capacity: 400mAh.