Red Mini Optical 2.4G Pen-Shaped Wireless PC Laptop Android Tablet Pad Mouse + USB 2.0 Receiver Innovative mini pen-style mouse provides accurate and easy control of the mouse cursor 2.4GHz wireless connection, up to 10m operation distance. Adjustable 500/1000 DPI optical sensor for smooth movement control Power saving: if there is no 2.4GHz signal, it will automatically power off Pen shaped, especially suitable for handwriting input. Real Plug and Play, no extra driver needed Low voltage alarm function, reminds you to replace battery in time. Designed with a wheel for page turning during PPT presentation