2 wire door phone 1. No camera, Non-visual 2. White plastic indoor, silver metal outdoor 3. Audio/Intercom/Unlock 2 wire ... phoneFeatures1. Converse with visitors and unlock the door remotely 2. Adjustable volume of the ringing, call signal sound ... -Hung Type Specifications Indoor UnitTypeHand Set, Non-visual, 2 WiresPower SupplyDC135V+1APower Consumptionmaximum10.5W, standby0.5WAmbient Temperature0°C ...