Indoor unit
-Bi-directional speaking system.
-Door lock release.
-With volume control and ringing tone level control.
-2 wires connected from indoor unit to outdoor unit.
-Product size : 169 x 127 x 30 mm (L x W x H).
Outdoor unit
-Aluminum metal case construction.
-Raining resistance, foce resistance.
-Unit size: 122 x 40 x 22 mm.
-Surface mount outdoor station.