Sunvito Key Finder,Wireless RF Item Locator Key Tracker Anti-lost Alarm Keychain,Key,Pet,Wallet,Cell Phone,Luggage Tracker(1 RF Transmitter and 5 Receivers) 12V 23A battery for the push remote button(Included), wireless range over 900 feets in the open air, IP44 waterproof,you can use them indoor or outdoor 52 ring tones to choose from and 4 volume control(25~110dB),which meets different requirements.High quality speaker makes the bell pure Easy to install,no batteries required for the receiver,just plug them into the outlet(110V US standard) Widely used: compatible with home furnishing, office buildings, hotels, factories ,home and etc Includes 1 remote transmitter button and 2 chime units,battery for push button,double sided sticker,screws,anchors,screw driver.All products CE, FCC, RoHS certified