| Modern doorbell can be divided into wired doorbell , | | | | doorbell without row of the advantage of cable can be |
| wireless doorbell (remote control doorbell), intercom | | | | use; Disadvantages: have distance limitations vulnerable |
| doorbell, video door phone | | | | to interference. |
| There are two types of Wired doorbell:DC and AC | | | | Generation doorbell, intercom, video doorbell. |
| power. | | | | Doorbell intercom doorbell in the original function, add |
| DC supply power by battery, 220V power supply is | | | | the intercom, it points to the indoor unit and outdoor unit. |
| used by AC. DC doorbell structure is simple, using IC | | | | Indoor unit looks like a telephone, listen to tell. Outdoor |
| block, and lower cost. AC doorbell is the principle of | | | | unit is a control panel on a doorbell and intercom button |
| making use of power coil. | | | | holes for indoor and outdoor dialogue. |
| Remote control doorbell has two sub-DC and AC. | | | | The wireless video door phone is developed based on |
| The remote control of DC switch on dry batteries, dry | | | | intercom doorbell. The most advanced doorbell |
| batteries in the doorbell is also used. Communication | | | | intercom system, based on its intercom, increase in the |
| with the remote control switch on the battery while the | | | | indoor unit display an increase in outdoor camera, so to |
| doorbell AC power supply, the principle of just more | | | | those who looks at a glance, the function adds an |
| than wired doorbell one more launcher, and a receiver. | | | | automatic unlock button, convenient and to match the |
| Wired doorbell has the advantage of stable and | | | | electronic door locks. |
| reliable, defects which had to wait a good line, wireless | | | | |