... time, inside buy a variety of chord tones, pictures, video and other functions; the touch button design, durable, wear- ... machine free form 1 to 1, 1 to 2,2 in 1, 2 to 2, 2 to 4, to meet the needs of ... indoor machine will save the visiting guests The photo or video / message as well as the visiting time, in case ... , by monitoring key, can monitor the external environment. 2 wire video doorbell for villa