Global-store 2.4GHz USB Wireless Optical Pen Mouse Adjustable 800/1200/1600 DPI Handwriting Smart Mouse for Laptop Android Tablet PC (Blue) Innovative mini pen-style mouse provides accurate and easy control of the mouse cursor, 2.4GHz wireless mouse, up to 10m effective distance Adjustable 800/1200/1600DPI optical sensor for smooth movement control, ergonomic design to fit comfortably on your hand Real plug and play, no extra driver needed. Designed with a wheel for page turning during PPT presentation Tracking Method: Optical technology. Operation frequency: 2.402GHz ~ 2.480GHz. Operating Voltage: 3V. Operating current: 15mA Working with Windows7/8/Vista/XP/2000, Android, Linux, Mac OS. NOTICE: Low Voltage Alarm Function: when battery is low power, the low-voltage alarm will light up, reminding you to replace the battery, rather than the pen mouse is broken