... radio band for wireless transmission of digital audio and video signals.It can be used in apartments, villas, ... doorbell, automatic camera store, master came back to free inquiry. Don't miss an important meeting.4, ... intercom function: the visit, the doorbell intercom calls, free, clear voice, such as in front of.5,remote ... Size 125×93×33Size150×60×35 Wireless Video Intercom for home door YET-WV-2.4CC