NAMEO Wireless Optical Pen Mouse, 2.4G 1600 DPI 4 Buttons Pencil USB Ergonomic Mice for Computer Laptop, Tablet PC, Smartphones (Grey) Innovative mini pen-style mouse provides accurate and easy control of the mouse cursor. 2.4GHz wireless connection, up to 10m operation distance. Adjustable 800/1200/1600 DPI optical sensor for smooth movement control. Pen size shaped, especially suitable for handwriting input. Powered by 1 x AAA Dry Battery (Not Included). System requirement: Windows 2000/XP/Vista/7/8, Linux, Mac OS, Android OS (with standard USB interface).