For a speedy processing of your order, please ensure you enter your phone number at checkout. Simplified Two-Wire Door Entry station. DA-1DS - Silver single call audio entry station | Simplified Two-Wire Door Entry Kit | Aiphone's DA series residential audio intercom provides audio comminication froma door station to an internal handset station. ( DA-1MD / DB-1MD ) | The DA Series features simple two wire cabling, AC operation by inexpensive plug pack and AC door release operation. | The DA series is available either in boxed sets containing a single door station and room station or as individual components for 2 or 4 call door station and individual handsets. _ SPECIFICATIONS: DA-1DS: approximately 270 g. Wiring: 2 wires, polarised from door to DA-1MD. Distance From door to master station (Wire Diameter: 0.6 mm / 0.8 mm / 1.0 mm): 110 m / 200 m / 310 m Master station to Power supply (Wire Diameter: 0.6 mm / 0.8 mm / 1.0 mm): 55 m / 100 m / 155 m Weight: 0.314