Glantop&reg; Flower Optical Portable Wireless Mouse with Nano Receiver and Mouse Pad (3 in 1 Set) Ultra Slim Portable Wireless Mouse Design 2 Level DPI,1000/1600,Adjust Different Speed. 2.4G Wireless.Up To 10M Distance,Scope Of Operation,Two-way High Rate Transmission,High Sensitivity,Low Power Consumption,Automatic Frequency Control,Strong Anti-jamming. Symmetric Design:Used to left hand mouse or the right hand holding the mouse,as applicable Please kindly find the nano receiver inside the battery