Aiphone Audio Handset, DA Series | AIP-DA-1MD The Aiphone Audio Handset, DA Series DA-1MD is a component of the Aiphone DA Series audio intercom system, designed for secure and convenient communication between residents or users inside a building and visitors at an entry point, such as a door or gate. The DA-1MD audio handset serves as a communication station for receiving calls and granting access to authorized visitors. Manufacturer's Limited Warranty 1 Year warranty Features Handset for privacy Service button to control an external device Call tone volume control with mute indicator Door release button (powered by door station) Technical Specifications Communication: Handset (full-duplex) Wire Type: Entrance Station to Tenant Station: 2-cond., overall shield - use Aiphone #822202 or 2-cond., low cap, PE insulation, solid, non-shielded -use Aiphone #871802 Power Supply to Tenant Station: 2-cond., low cap, PE insulation, solid, non-shielded -use Aiphone #871802 Distance: Power Supply to Tenant Station: 180'(22AWG), 510'(18AWG)Entrance Station to Power Supply (cumulative): 360'(22AWG) 1,020'(18AWG) Product Literature Aiphone DA-1MD Audio Handset Installation Manual Aiphone DA-1MD Audio Handset Operation Manual Aiphone DA-2DS, DA-4DS Installation Manual