... system is oriented to luxury villas, households, companies use the security products. Using a 7 inch TFT analog ... , inside buy a variety of chord tones, pictures, video and other functions; the touch button design, durable, ... free form 1 to 1, 1 to 2,2 in 1, 2 to 2, 2 to 4, to meet the needs ... when in standby mode, by monitoring key, can monitor the external environment. 2 wire video doorbell for villa