Features:Good quality and 100% Brand New.Extend your home security system No Wiring is required， Plug-and-Play Keeps you aware of intruders or visitors anywhere around your home Door chime trigger by motion Don't miss a visitor / customer / friend / client Suitable for Home， Office， Unit， shop， warehouse， shed， Garage etc Light control distance is 3-7 meters. It is advised to use it in the places where there is enough light. Avoid the line laying trouble and expenditure 3 x 1.5v AA batteries ( Not included ). Three settings: Music / Off / Voice The chime is triggered by detecting the motion of the visitor passed by. 1 inch diameter， 0.25 W speaker produces loud sound which can be heard far away.Pressing the music selection button to change the music/sound. Provided with a selector switch to select human voice or 16 different music/sound.