Perman Portable 1600DPI 2.4GHz Wireless Optical Mouse Mice with USB Receiver for Computer PC Laptop Notebook Blue Size: 95*54*30mm. Mouse type: Wireless Optical Mouse. Interface: USB. Mini adapter Plug and play. Power switch for save power. Resolution: 400-1600DPI conversion. Power Supply: 2 x AAA Battery (Not included) With 6 Keys, including Scroll Wheel, Page Forward and Page Backward buttons for easy Internet Surfing. Portable and weight light, very convenient to carry and store. Wireless transmission, the longest sensing distance up to 10-15 meters.