2.4G Wireless Vertical USB 6 Keys Mouse Ergonomic Design Optical 2400DPI Mice Features: Vertical mouse 2.4GHz Wireless Connectivity (USB receiver ) Ergonomic designed to remit and carpal tunnel syndrome. Optical technology for control User convenience with wow-pen's, pen-grip comfort. L/R mouse buttons, 2 thumb buttons, and a clickable scroll wheel , dpi button. You pick the hand position that best you. Plug and play, compatible with. Parameter Project Type: Vertical mouse Produce Name: 2.4G wireless mouse Wireless Technology:2.4G Wireless distance: 10m Rated voltage / current: 1.2V/20mA Power supply: 2 x AA batteries (not included) Number of keys: 6 keys4 buttons and 1 wheel (middle button)and dpi(adjustable) Optical resolution: 800dpi1600dpi;2400dpi. Color Classification: Black. Work: Photoelectricity Button click life: 8 Million times Material: ABS Product weight: 87g Produce size: 12.3x6.2x7.5cm Packing size: 12.7x7.4x8.6 Packing weight: 125g Package Included: 1 xMouse 1x Receiver