One of the most popular types is a wireless intercom system.
These devices are small and portable, so you can easily move them if needed. Usually, they provide the signal by using radio frequency.
-Another type that is commonly used is a wired intercom.
Usually, this type is more expensive than the wireless one, but it’s considered to be more reliable.
-Video intercom.
this type of intercom is equipped with a camera on the outside and a screen on the inside. So, you’ll be able to see your visitors without opening the door.
-An audio intercom system is not as common now, as many people prefer ones with cameras. These systems allow you to communicate with your visitors, but you can’t see them.
-The newest type is a smart intercom system that can be controlled through an app on your smartphone.
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