Feature: Great alternative to a mouse, perfect to navigate the cursor. The mouse is pin-point accurate. It feels quick and responsive cause it is like using a pen, so it is very intuitive to guid on the sn. Distance-wise : We have done a test it for as far as 7~8ft and great. Ultra-portable: it fits in your pocket, and take it to wherever you go. No setup: plug and play. It took all of three minutes to get it working. Pop in a 'AAA' battery, connect the USB dongle. Great for drawing, signing , Photoshop, diagramming and presentations or any heavy mouse application Good for using in limited space or unusual places where a normal mouse is a bit bul to use, fits comfortably in the hand, button placement for left and right mouse clicks are in good placements for easy clicks 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. The auto sleep function works well to conserve battery, as well as the conveniently positioned on/off switch. Specification: Tracing system: optical Operation frequency: 2.4GHz ~ 2.483GHz Operation distance: up to 10 meters Three resolution Adjustable: 800/1200/1600dpi Operating current: 15mA System requirement: Windows 2000/XP/Vista/7, Android, Linux, Mac OS. Number of keys: 4 Battery type: 1 * AAA Battery (not included) Color: Gray, Blue, Red Package included: 1x Pen Mouse 1x USB 2.4GHz Receiver 1x Mount