Minidiva Wireless Optical Pen Mouse 2.4G 1600 DPI 10m Touch Pencil usb Ergonomic Mice for Computer Laptop Desktop(Darkgrey) 2.4G Touch pen mouse with web browsing, 10m effective distance. Ergonomic design: fits comfortably on your hand. 3-resolutions Adjustable: 800/1200/1601 dpi. Createn professional designs. Compatible device: perfect for laptop , tablet PC, smartphone.