[4 in 1 Multi-function] Marsboy Battery Wireless Doorbell Cordless Chimes with Remote Receiver, Motion Sensor/ Burglar Alarm/Flashlight, 500 feet Transmit Range&36 Melodies, 3 Level Adjustable Volume Wireless Doorbell: Within 36 chimes & 3 level adjustable volumes, everyone can find favorite song with perfect volume. Burglar Alarm: Informing unwanted visitors with 30 seconds alarm, and 15 seconds LED light on at 2-5 meters detecting range. Motion Sensor: hold the doorbell in hand and cover the motion sensor, there will be 20 seconds light on to lighten your area. Emergency light: When it gets dark, the 5 bottom LEDs can stay on for 20 seconds; you can hold doorbell in hand used it as a flashlight. Simple to set 4-in-1 doorbell: Easily set up, get rid of worrying wires or drilling holes; 1 small 12V battery is included for push button.