Another equipment of the surveillance-protection-security system is in automatic openers, which are available in two forms.

Audio door opener Audio door phone
Video door opener Video door phone

These door openers are used to open small or individual doors. These door openers have a similar function to each other, with the difference that the audio door openers use the voice exchange system to open the door, but in the door opener. Video systems A video or video system is used to exchange information and open the door. Audio and video door opener systems consist of four general parts.