This is a new generation of vertical mouse, comfortable grip, suitable for office, games, etc., support ergonomic design.6D Wireless Mouse 2.4GHz gaming game mouse Ergonomic Design Vertical mouse 2400DPI JOY Wrist Pain USB Mice For Laptop PC 3.Note: This mouse requires 2*AAA battery(NOT INCLUDE) Specification: Project Type: Vertical healthy mouse PRODUCT NAME: 2.4G wireless mouse Brand: HXSJ Wireless Technology:2.4G Wireless distance: 10m Rated voltage / current: 1.2V/20mA Power supply: 2 * AA batteries (included) Number of keys: 6 keys(4 buttons and 1 wheel (middle button)and dpi(adjustable) ) Optical resolution: 800dpi;1600dpi;2400dpi. Color Classification: Black,Gray. Work: Photoelectricity Button click life: 8 Million times Material: ABS Product weight: 87g Item size: 12.5*6.5*7.5cm Packing weight: 125g Packing size: 15.5*8.5*8.4cm System requirements: Windows 98 / Me / 2000 / XP / Vista / Win 7 / Win8 /10/Vista Mac OS or latest.