ERAY Wireless Welcome Doorbell PIR Motion Detector Sensor Visitor Alarm Chime Door Bell for Shop Home Store (Only Doorbell) MultifunctionalIntelligent greeting warning doorbell, welcome your guests with beautiful song or human voice Ding Dong, Hello, Welcome automatically. Motion DetectorDoor chime trigger by motion, alarm triggered, keeps you aware of intruders or visitors anywhere around your home. Long Detection RangeLight control distance is 13ft~19.7ft (4m~6m).The chime is triggered by detecting the motion of the visitor passed by. 32 Music Tones32 different melodies for choice, selector switch to select human voice or different music/sound, music selection button to change the music/sound. Applicable SceneSuitable for dwelling houses, tier buildings, multiple apartments, shops, offices, factories and so on.