iKross 2.4G Portable Compact Wireless Optical Mouse Mice for Laptop Computer PCs, 2 DPI Levels (800/1600) - Blue/Black Compact size for easy storage and travel, and ergonomic design fits well in your hand. Featuring high-precision optical tracking and adjustable DPI settings (800/1600). Includes pre-programmed forward/back navigation buttons (this feature not compatible with IOS) Powered by AAA batteries(not included) Package includes: iKross Wireless Compact Mouse, 2.4G USB receiver. ( Wireless receiver conveniently located in the battery compartment )