3 wire intercom
Hardwired PoE video doorbell, how it works?
Tuyaoem
TF1-EM-W Tuya APP TF1 Stand Waterproof WIFI
Dragonsview 7 Video Intercom Doorbell Phone Color LCD Metal Outdoor Panel Support Lock Exit ButtonNot Included Call Door Phones From Zipitang, $106.92
UTP/IP WiFi Home Security 7' Video Doorphone Door Bell Interphone Intercom System - China Intercom System, Door Bell
TMEZON 7 inch Wireless/Wired Video Door Phone WiFi IP Doorbell Intercom Entry
Video Door Intercom Archives - ipvisions
Tuya 1080p smart doorbell camera PoE wireless Wi-Fi AC 8-24V DC 9-36V built-in PIR motion sensor video intercom door phone