CACAZI A10DC 1 To 2 Battery Type Home Smart Waterproof Electronic Wireless Doorbell 1. Material: ABS, electronic components 2. Features: long transmission distance, built-in 36 music ringtones, 4-level volume adjustment, LED flashing light reminder, strong penetrating ability 3. Applicable range: 300 meters 4. Music: 36 pieces of music 5. Volume: 4 levels of volume 6. Power supply mode: battery power supply 7. Receiver battery: No. 5 battery x 3 (battery is not included in delivery) 8. Transmitter battery: 12V 23A battery x 1 (delivery without battery) 9. Installation method: double-sided tape fixed screw fixed 10. Waterproof grade: IP44 11. The receiver has an indicator light, and the bell light is on 12. Strong penetrating ability to meet household needs 13. Long-distance barrier-free 300-meter penetration 14. The waterproof design of the transmitter can prevent the intrusion of rainwater, safe and durable 15. Product Dimensions: Transmitter: 7.5 x 5.1 x 2 cm, Receiver: 9.5 x 6.5 x 2.4 cm