- The button supports up to 20PCS, and the receiver supports up to 100pcs.
- The transmitter without screw chuck design to achieve waterproof and dustproof.
- Eye-catching backlight flashes when someone pushes the doorbell. Particularly suitable for the elderly, deaf, and pregnant women.
- Uses machine-learning to prevent interference from other transmitters.
- The transmitter USE a 23A12V alkaline battery (not include battery).