We solemnly promise that aslong as you have a problem, or are not satisfied, we all support to reason to100% refund service. ?Product Detail? ? Number of keys: 3? Battery type: A+++(but not included) ? Wireless technology: 2.4GHz wireless ? USB Nano TransceiverPlug and play, can be attached to the bottom ofthe mouse wireless ? Transmission distance: ?10 M? Note: Curved mouse power is on, flat close, no switch button? Applicable models: Desktop PC Notebook Universal curved mouse powersupply that is open, put that is off, without the switch button; green lightflashes that the battery has begun to work, then turn off to save power ? Precise optical technology, movement can be detected in near allservice. ? Perfect arc design fit your palm perfectly; Better grip, easyoperation; comfortable handling. ? Optical sensor can work on most of the surfaces, thus it needs not amouse cushion.Package include:*1 x foldable wireless mouse*1 x Receiver ? Auto on/off power saving technology, the mouse will turn offautomatically without motion and clicks within 3 minutes. ? Let your hands will not fatigue and pain wireless foldable opticalMouse/Mice ? Nano transceiver plug and play, can be attached to the bottom of themouse ? Bend Mouse Power that is open, flat that is closed , without switchbutton ? Foldable desgin, folds to 60% of its fully expanded size. After beingfolded up, the mouse shut up automatically. It's very convenient and easy tocarry with.