... to video, intercom, unlock, infrared night visionfunction! 1. outdoor temperature feature: before going out in the ... voice clarity, as in the front.5. remote control lock function: family home too late; it's ... slight press, visible,press again, automatically unlockThis system can be used in apartments,villas,hotels,offices,public ... 4G Wireless video doorphone doorbell Intercom System 1 V more more V ...