How to choose?
A10 & A20 doorbell is basic function, can not work as a home security alarm system. Their function is the same. only looks different. A30 & A40 doorbell can work as a home security alarm system. They compatible with 433MHz wireless detectors. A40 support wifi app function. You will receive phone app message if someone press the doorbell button. If you do not know how to choose. Best recommend the A30 & A40 doorbell.
Intelligent Wireless Doorbell
Warm Prompt: (A10 and A20 have the same function, only looks different, you can choose A10 or A20 wireless doorbell)
• 36-38 ringtones to choose from and 3-step volume control (0~85dB) • 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 wireless transmitters • Designed to last up to 25 years • Working frequency: 433 MHz • Receiving distance: 300M(in open area) • Transmitter size: 75 x 51 x 20 mm Receiver size: 95 x 65 x 24 mm • Receivers Rated voltage : AC 110V-220V -240V • The transmitter 12V23A battery factory pre-installed (battery not included)
A30 / A40 doorbell