**Ultra-portable: mini size, just like a pen. It fits in your pocket, take it to your class, meeting and wherever you go. You can use a wireless mouse anywhere you like.**DPI Adjustable 800/1200/1600 DPI adjustable. The adjustable DPI helps in finding a proper 'speed'. The grip is very natural and you can position your arm close to the body, or even on the body for comfort.**Wireless carrier frequency: 2402 MHz-2480 MHzWireless working channels: 16, automatic frequency hoppingRated working voltage: 3VRated working current: 15 mATracking system: opticalSpeed: 14 inches/sec**Power Saving - Wireless 2.4G touch screen pen mouse, come with USB receiver, up to 33ft effective distance. The mouse is power by one AAA batteryNot Include, plug and play, no extra driver needed. The auto sleeps function, no worry about waste of your battery.**Easy to Use Good for using in limited space or unusual places where a normal mouse is a bit bull to use, fits comfortably in the hand, button placement for left and right mouse clicks are in good placements for easy clicks.System Supported: Compatible with: Windows10/ ME/ NT/2000/XP/Vista/7/8 ,Android ,Mac, OC etc. Battery: 1 x AAA battery (not included).Item NO.173661759