Features: 1.Body Induction: This door sensor alarm adopts infrared body induction, so it plays voice automatically when detect people passing by, induction range up to 6.6yd. 2.Customization Voice: This motion sensor doorbell supports customizable voice, which can be changed through USB cable. 3.2 Modes: This motion detector doorbell supports induction and wireless controll, up to 55yd remote control distance. 4.Inbuilt 2W Speaker: This wireless doorbell has inbuilt 2W speaker and the volume can be easily adjusted. 5.Accurate Induction: This door sensor alarm features intelligent control chipset that ensures accurate induction and sensitive response. specification:Item Type: Door Sensor Alarm Material: ABS Product Use: Welcome / Safety Tips Audio Output: 2W / 8 Ohms Audio Bit Rate: 16 to 320kbps Induction Distance: 0 to 6 Meters Sensing Range: 120 Degrees Sector Voice Change: Chage via USB Cable Audio Format: MP3 Audio Format Inbuilt Lithium Battery Capacity: 500mAh (Battery Included) Remote Control Battery: CR2032 (Battery Included) Battery Capacity: 140mAh PackageList:1 x Door Sensor Alarm 1 x Holder (2 Accessory/Set) 1 x USB Cable 1 x User Manual 1 x Remote Control