Visual doorbell, as the name suggests is the visible doorbell call can accept the visitor downstairs in the home, not only can talk, but also through the camera to see the visitors were identified, and finally press the unlock button to open the electric door lock for the guests to come in. Due to its superior performance and convenient use, the visual doorbell is now widely used in urban residences around the world.

The building door is always in a locked state, so as to avoid entering the building without permission, and the residents inside the building can freely enter and exit the building with the key. When a guest comes to visit, the guest should call the room number of the resident who wants to visit the host on the keyboard of the intercom outside the building. The host of the interviewed resident has two-way conversations or visual calls with visitors through intercom equipment, confirming the identity of the visitor through the voice or image of the caller. After confirming that the visitor can be admitted, the owner of the house uses the unlocking key on the intercom extension to control the electric door lock on the entrance door of the building, and the visitor can enter the building. The guests entered the building, floor, door lock.

Wireless doorbell

Wireless doorbell, also known as wireless remote control doorbell or remote control doorbell, it is the use of civilian wireless technology developed a doorbell, the general effective transmission distance of about 40 meters. The wireless doorbell does not need wiring, installation is simple and flexible, visitors at the door bell, the door alarm will sound, is now very common in Home Furnishing a doorbell.

The use of wireless doorbell is very simple, as long as the outdoor unit and the indoor unit and lock controller are respectively installed, the visitor pressed when the outdoor machine, indoor machine will ring master by the controller to open the door to let them in.

Electronic doorbell

The electronic doorbell is composed of a time base circuit, an integrated block and peripheral components. Its sound quality is beautiful, realistic, simple and easy to install, low cost, a 6V laminated battery can be used for more than three months, the power consumption is low.

Normally, two audio oscillators do not work, and the speaker does not produce sound. When the guest presses the doorbell button, the door bell discharges rapidly, and the two audio oscillators work at the same time, and the generated audio signal is mixed and amplified to drive the horn to make a "sting" sound. When the guest key is released when the doorbell, fast charging, audio oscillator is stopped, the audio oscillator generates the audio signal after amplifying, promote the horn "boom" sound.