4 Receviers: Attach the receives to any 4 items. Just press the button of the corresponding color on the transmitter and the receiver will make a sound so you can find them quickly. Wide wireless coverage: Item finder up to 75-85dB beeping sound and 35m (115ft)wireless range in open area! Light: Wireless key finder receiver with LED light , leading you to find your lost item at night. A great gift: to forgetful person, elders friends, a friend who is easy to lost things etc. Even you can let it help find your little pets, cats and dogs, etc. long standby time: Low consumption. The battery is delivered inside the package.