... mini wireless optical mouse 2.mini nano receiver 3.1 year warranty ... Contents:Mouse, Nano-receiver , Battery, User documentaion,Warranty&quality assurance cardsAdvantage:1.Plug it in once and forget ... to remove it the receiver stores inside the mouse.2.You get a powerful ,reliavle connection,with virtually ... work and game are handly. Factory direct sale high quality wireless mouse with 1year warranty