... accessories, nice business gifts2.4GHz USB Optical Wireless Mouse For PC/LaptopPackage Contents:Mouse, Nano-receiver , Battery, User documentaion,Warranty&quality assurance cards Advantage ... need to remove it the receiver stores inside the mouse. 2.You get a powerful ,reliavle connection,with virtually no delays or dropouts ... adjust it to achieve the most appropriateDPI to work and game are handly.