Motion Sensor Doorbell Features: Receiver 8 Chord Music Chip, 40mm Large Speaker,More Pleasant, Louder. Colorful LED Lights With Adjustable Brightness,Adjustable Brightness. Wireless Doorbells for Home,Motion Sensor Doorbell Buttons Resistant to Low Temperatures! Motion Sensor Alarm Application: Wireless Ring Doorbell Motion Sensor Alarm is Mainly Used In Homes,Shops,Villas,Schools, Companies,Hospitals and Other Places.Long-Distance Transmission Up to 400 Meters.The Doorbell Button Was Pressed More Than 100,000 Times.Battery Life Up To 3 Years. Motion Detector Alarm Ring Doorbell Wireless Features:36 Music,4 Music,5 Welcome Languages.Motion Sensor Alarm Has 5 Modes: Doorbell,Alarm,Color Light,Night Light,Welcome Alert and Other Modes.Pressing The M Key Will Cycle Through These 5 Modes.4 Levels of Volume and 4 Levels Of Light Brightness Can Be Adjusted. To Stop and Shut Down,Press The Host Switch. Door Alarm Sensor Installation Method: Wireless Door Chime When Installing,The Bracket Is Placed On The Desktop,Easy to Move Flexibly,and Can Also Be Hung On The Wall By Screws.Please Install On a Clean Surface,If The Metal Door Can Be Installed On The Wall. Take Out The Double-Sided Adhesive Tape And Stick It On The Mounting Plate Of The Doorbell Button. Motion Detectors Secrui Wireless Doorbell Battery Precautions:The Doorbell Button Indicator Is Dimmed,The Distance Becomes Short, and The Battery Can Be Replaced.The LED Blinks Once Every 3 Seconds.Please Replace The Battery In Time.Wireless Doorbells Can Be Used Correctly to Extend Battery Life.If You Have Questions,You Can Leave Us a Message,We Will Be The First Time For You to Answer!