Check the listing for details. AIPHONE LEM-1DL Audio Master Station,12VAC 36TR80. Condition: New. Listed at 318.10 USD. Primary Station, Indoor, Height (In.) 2 1/8 in, Width (In.) 7 1/16 in, Depth (In.) 5 5/8 in, Door Station Height (In.) 2 1/8 in, Door Station Width (In.) 7 1/16 in, Door Station Depth (In.) 5 5/8 in, Master Depth (In.) 2 1/8 in, Master Height (In.) 7 1/16 in, Master Width (In.) 5 5/8 in, Distance (Ft.) @ 18AWG 1,570 ft, Distance (Ft.) @ 22AWG 650 ft, Wiring Conductors 2 Conductors, Wire Type 22 AWG, Power Source 12V AC, Voltage 12V AC, For Use With LEM Series, Includes Mounting Hardware The AIPHONE(R) audio master station is an audio only communication and entry security system. Features door release (N/O contact), calling and 2-way communication, and call tone and voice volume control. When called by tone, press talk to replay, press door release button to release door and press off for s.