Yoyorule Portable 2.4G Wireless Optical Mouse Mice For Computer PC Laptop Black Size:95*54*30mm. Interface: USB. Wireless transmission, the longest sensing distance up to 10-15 meters Portable and weight light, very convenient to carry and store With 6 Keys, including Scroll Wheel, Page Forward and Page Backward buttons for easy Internet Surfing Power Supply: 2 x AA Battery(Not included)