1HD Camera: The home doorbell adopts ultra high definition camera board, and the photo effect is good. Exquisite and durable, with infrared night vision function. 2Multifunctional: This wired doorbell has hands free intercom function, electric control lock function, outdoor monitoring function, indoor intercom function. 3Unique Design: The video surveillance camera has a thin design and 25 ringtones to choose from, all of which make it a luxurious and high quality decoration style. 4Use: The wired video doorbell can support up to 1 outdoor unit and 4 indoor units at the same time, the outdoor unit has a rain cover, and the outdoor unit has a ringback tone for calls. 5Connection Line: The available distance of the connection line of the intercom doorbell is 200m, and the guide rail of 5x0.75mm can be used, which will not affect the displayed pictures and intercom.