Ultra Portable:2.4G wireless optical pen mouse, mini size, just like a pen. It can fit in your pocket and take to your classes, meetings and anywhere you go. You can use your wireless mouse anywhere you like.DPI Adjustable:800, 1200, 1600 DPI level adjustment - 500/1000 to help you find the right ""speed"". The grip is so natural that you can place your arms close to your body or even on your body for comfort.Power Saving:Equipped with a USB receiver, the effective distance is up to 33 feet. Powered by a 1x AAA battery (not included), plug and play. Automatic sleep function, don't worry about wasting battery.ERGONOMIC DESIGN:Comfortable fit for your hand, pen shape, perfect for handwriting input and graphic design. Designed with wheels to turn pages during PPT presentations.Best Gift:Compatible with: Windows ME/NT/2000/XP/Vista/7/8, Android, Mac, OC, etc. The perfect gift for teachers, professors, classmates, colleagues, friends and leaders.