feature:1: 2.4GHz wireless connection (USB receiver)2:2X AAA battery version (not included)3: Ergonomically designed to relieve and prevent carpal tunnel syndrome.4: Precisely controlled optical laser technology5: Easy to use, comfortable to hold, prevent mouse hands.6: L/R mouse on, 2 thumb ons and a clickable scroll wheel, 2 dpi ons (dpi+/dpi-).7.You choose the hand position that suits you best. Plug and play, compatible with Mac. Specification:1: Project type: Ergonomic optical mouse2: Resolution: 800dpi; 1600dpi; 2400dpi.3: ons: 4 ons and 1 wheel (middle on) and 2dpi (adjustable)4: Maximum operating range: 10m5: Color: Black +red6: Material: ABS7: on life: 5 million times8: Power supply: 2 AAA batteries (excluding batteries)9: System requirements: Windows98/Me/2000/XP/Vista/Win7/Win8/win10 or the latest version.10: Product size: 10*8.5*7cm11: Item weight: 80g (including USB receiver weight)12: Package size:12.2*8.7*8.3 cmThree-level power saving mode:1: Enter the first sleep light and blink continuously for three seconds2: Enter the second sleep in about 1 minute, flashing lights intermittently3: About 8 minutes, enter level 3 sleep, the light goes out