*1 RF transmitter (Remote Control) and 4 receivers for locating different items like keys， TV remote control ，glasses wallet or other items.*30-40m(98-131fts) transmitting range， so that you can locate the items easily at most of corners in your house. It is with strong signals even if through a floor or walls.*With a docking base， It 's a good display for tea table， TV bench， bed， computer desk， or bookshelf.*Easily and quickly to locate the lost items， by pressing on the related color buttons， the beep sound will show you find the lost items. No APP， No Bluetooth Needed.*With LED flash light on the transmitter， it is extremely handy when you need to find something in the dark.SpecificationSize (transmitter): 105×46×13mmSize (receiver): 50×36×11mmBattery (for transmitter): AAA，1.5V ×2pcs (NOT included);CR2032 (1pc/receiver， included)Sound: 90~100Db (Open Space)Transmitting Range: 30~40 metersFrequency: 433.92MHzHousing Material: ABSPackage Included: (With Retail Gift Box)1 x Transmitter4 x Receivers4 x Coin Batteries (for receivers)4 x Key Ring4 x Adhesive1 x Docking Base1 x User ManualNote: 2 X AAA， 1.5V battery (for transmitter) is NOT included.