Wireless Video Intercom System The indoor unit uses a high-definition ... 4GHz radio band for wireless transmission of digital audio and video signals.It can be used in apartments, villas, hotels ... 't miss an important meeting.4, visual intercom function: the visit, the doorbell intercom calls, free, clear voice, such as ... 64 Size 125×93×33Size150×60×35 wireless video intercom with Camera YET-WV-2.4CC