Feature: 1. Convenient Installation: 180°rotation, suitable for installation on walls or other objects at any angle, flexible adjustment to meet requirements. 2. Long Distance Sensing: Long distance infrared sensing, infrared sensing up to 5 meters, more sensitive and safer protection. 3. High Quality Material: Made of ABS material, sturdy and durable, and long service life. 4. Multi Function: The doorbell can also be anti theft. During the day when guests enter, there will be a welcome message, and at night, an intruder will sound an alarm. 5. Multi Purpose: It can be used as a motion sensor ringtone, door alarm, mailbox alarm, retail business welcome doorbell. Specification: Item Type: Infrared Smart Reminder Material: ABS Color: White Battery: 3 x AAABatteries (Not Included) Detection Distance: Approx. 0-5m/0-16.4ft Sound Pressure: 75dB-95dB±5dB Induction Method: Infrared Induction Trigger Volume: Four Levels Adjustable Detection Angle/Range: 60 Degrees Up and Down, 110 Degrees Left and Right Ambient Temperature: -25℃-55℃ Uses: Home, Shop, Shopping Mall. Package List: 1 x Infrared Sensor Doorbell2 x Screw2 x Expansion Tube2 x Double Sided Adhesive Sticker2 x Sticker