Feature: 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. Package List: 1 x Door Sensor Alarm1 x Holder (2 Accessory/Set)1 x USB Cable1 x User Manual1 x Remote Control