Simple, plug-and-play USB wireless connection; PC and Mac compatible 2 4Ghz wireless connection for lag-free performance Nano wireless receiver small enough to plug in once and leave connected; receiver conveniently stores in mouse when not in use Small ultra-portable design with sleek, glossy finish; Mouse measures L x D x H (in): 2 x 3 x 1.1. Includes 1x AAA Battery Verbatim has been a trusted brand since 1969 and guarantees this product with 1 year limited warranty and technical support