YY-318 whistle key finder color :red,blue,black body size:40.2*34.2*11mm whistle size:52*33.5*10mm batter:AG3*2PCS Distance:7--10m instruction *Use a twin adhesive and stick it on the TV remote control or there is a strap on the model ,fix it on the monbile phone or fix it on the key. *The model will be beeping and flashing after you whistle with mouth or use the whistle. *There is a nylon strap on the whisle ,you can hang it around your wrist or put on the hook. Attention *Please do not lose the plastic whistle. *Please pay attention to the mode if it works excessively the battery power will quickly be consumed. *Please keep out of the reach of childen. *Please do not use it for other purposes. Besides whistle it can also be workde by the similar frequency of the other sound. made in china.