It can quickly and conveniently locate your backpack, keys, wallets or anything valuable belongings to which it is attached when you are in a hurry It’s a unique and quick method of finding lost keys It has an LED flashlight which helps to find things more easily in the dark The tracker is a kind of Bluetooth 4.0 low energy product Compact size and lightweight design and low energy consumption Supports Bluetooth 4.0 and the effective range is up to 30-40m The ON / OFF switch is located at the right side of the transmitter, which allows you to turn on and off the LED flashlight easily The transmitter is removable from the base and can be carried with you to find lost items Specifications: Working Range: 30 - 40m (open space) Sound: 75 - 80dB Frequency: 433.92MHz