Product Description: Reliable 2.4 GHz wireless keyboard and mouse combo: A tiny nano-receiver connects both the keyboard and mouse using just one USB port; Low-profile, whisper-quiet keys ensure comfortable and smooth typing; Hot keys keep access to applications and media control easily; DPI button easily adjusts the sensitivity of the mouse between 3 DPI levels (800/1000/1200); The Nano-receiver can be found in the battery compartment of the keyboard/mouse.