HikVision 2-wire video intercom kit for villa or house, only one call button.max 4 devices in total. Kit consists of 1 x DS-KD8003Y-IME2/Surface door station, 1 x DS-KH6320Y-WTE2 indoor station, 1 x DS-KAD704Y, 1 x DS-KAW30-2N, 1 x 16GB TF card.