... color: client request 4) 2.4Ghz Wireless 2.4G wireless mouse Package Contents:Mouse, Nano-receiver , Battery, User documentaion,Warranty&quality assurance cards Advantage ... it the receiver stores inside the mouse. 2.You get a powerful ,reliavle connection,with virtually no delays or dropouts, ... and a smart sleep model extends battery life. 4.Between the 800/1200 DPI free conversion,you can adjust it ...