Item Type: Key FinderMaterial: ABSWorking Frequency: 433.92MHzWorking Distance: Approx. 15-35m / 49.2-114.8ft (Open Area)Volume: 75-85dBTransmitter Battery: 2 x AAA Batteries (Not Included)Receiver Battery: CR2032 (Not Included)Package List1 x Transmitter8 x Receiver1 x Manual8 x Key Rings2 x Double Sided Stickers2 x Sheets of Stickers18 Receivers: There are 8 receivers in total, which can be hung on keys, TV remotes, mobile phones, wallets, pets, luggage, etc, you can find multiple items at the same time. 2Loud Volume: You press the corresponding color coded button on the remote control, when an object is nearby, the device will emit a sound at a volume of 7585dB. 3Large Range: The radio frequency can easily penetrate the wall, cushions and doors, and the distance is long, the search distance is 1530m/49.2114.8ft in diameter. 4Easy To Use: Anti lost wireless key finder, no APP, just one tap, easy to use, very suitable for finding keys, wallets, glasses, mobile phones and other easy to lost things. 5Long Battery Life: This finder receiver uses CR2032 button battery for power supply (not included), and one battery can be used for up to 6 months to meet your needs.