4 wire 3.5" door intercom two way door phone,infared door phone,waterproof phone ... Camera with night vision Outdoor station, door bell, video intercom, audio/video communication Watching door entrance, remote lock release ... and 4'' color TFT LCD Surface mounting installation Calling, intercom Watching door entrance Pressing button, opening the door Plastic case ... W.: 1.70 KGS 4 wire 3.5" door intercom