ANENG Home Intelligent Electronic Remote Control Waterproof Wireless Doorbell 1. Material: ABS flame retardant 2. Transmission distance: about 20 meters including indoor obstacles 3. Working voltage: receiver AC220V50Hz transmitter DC12V 4. Battery model: 12V23A (not included) 5. Weight: receiver 50g; transmitter 29g 6. Long-distance signal transmission, signal through the wall, one press to ring 7. Large sound space, good resonance effect, stable sound to provide convenience for the family 8. Adopting intelligent power management technology, low power consumption can be plugged in for a long time 9. The product is powered by a 23A 12V battery (not included), which is easy to replace 10. Smart wireless doorbell, four-level volume adjustment, the penetrating power of the ringtone prompts someone to visit 11. Choose your own ringtone, 25 pleasant ringtones for friendly reminders 12. The doorbell transmitter has long-lasting battery life. Pry open the cover from the bottom button and install a 23A battery according to the positive and negative poles. 12V battery (not included) 13. Note: The main unit and the doorbell are usually paired at the factory. In special cases, users can pair them by themselves. The pairing process is as follows: After the receiver is powered on, press and hold the [Music Key] and [Volume Key] at the same time, and then press and hold the [Bell Key] of the transmitter at a close distance. The indicator light keeps flashing to indicate that pairing is in progress, until music is played, indicating that the pairing is complete, then you can release the three buttons