GREENCYCLE Wireless PIR Motion Sensor Entrance Alert Chime Home Welcome Doorbell for Shop, Office, Villa, Restaurant - IR Remote Control, 36 Melodies, Volume Adjustable, LED Night Light Mode (2 Pack)

Four kinds of functions: 1.Welcome Mode:when the infrared sensor detects someone, it will generate a ""Hello,Welcome"" 2.Alarm mode:volume is up to 113db,can switch to alarm mode during night and detect the thief within 8M through the infrared detection 3.Night Light Mode:the receiver with led bulb has 4 levels brightness at corridor or passway 4.Doorbell mode: 36 melodies for choice,40mm big horn