Which key does the doorbell pager press to open the door for the other party?

The unlock key will have a key symbol, which means "unlock". It should be noted that some doorbell pagers need to pick up the phone and press the open button, while others don't need to pick up the phone and just press the open button. Self-generating wireless doorbell: it is a new energy-saving product that changes radio transmission on the basis of traditional wired doorbell and adds power generation device by Faraday principle to realize battery-free.

Extended data

Pager: doorbell button, an outdoor mechanical and electronic device, sends a normally open or normally closed command signal to the receiver. Radio signal is used to transmit and send instructions, so it cannot be separated from power supply.

In order to save energy and the trouble of replacing batteries, as well as the pollution of the remaining batteries to the environment, the self-generating wireless doorbell adopts Faraday principle and has a built-in power generation device in the pager. Pressing the button will generate current and voltage to power the command and transmission unit, and then transmit it to the transponder by radio transmission.

Answering equipment: outdoor answering and receiving equipment. When the call signal of the outdoor call button is received, the function of reminding is achieved through the sound and light prompt response. With the improvement of people's living standards, the answering machine has added many special functions, such as time, temperature and nightlight, which greatly facilitates people's living habits.

strong function

1, no battery self-generating function, usually many wireless doorbells use 12VDC for power supply, and the remaining batteries after use cause environmental pollution;

2. Wireless call function;

3. Add other auxiliary functions, such as temperature sensor, night light triggered by LED or clock unit with digital tube on the receiver.

References:

Self-generating wireless doorbell. Baidu baike