Two-way full-duplex simultaneous video intercom, Ultra-low power consumption, ultra-long standby time. 4.3-inch IPS screen, full-view display, clear visibility ,2.4G proprietary protocol, long transmission distance, stronger signal Indoor unit in continuous plug-in mode for fast response, System automatically saves photos and records video upon card insertion Video doorbell without WIFI, enhancing information security ,Wireless installation, one-click pairing, easier installation Infrared night vision function, Indoor unit with 6-song switching function, Manufacturer: Akfldms