... 3.5"video door phone handset villa kit two way door phone,infared door phone,waterproof phone,manufactuer offer 4 wire 3.5" video door phone handset villa ... entrance, remote lock release Optional for extended monitors and handset Works with our all Sipo indoor monitors Aluminum case Flush ... 836 (Indoor Monitor): 4'' B/W flat CRT, 3.5'' and 4'' color TFT LCD Surface mounting installation Calling, ...