The LEM-1DL is a surface/desk mount single call master station from Aiphone which features an inbuilt door release relay for high quality operation. The LEM-1DL master station comes with 2 way and calling communication, voice/tone volume control, an AC12-16V/12-24V power supply requirement (not included), as well as a press to talk button, and a user friendly design. The LEM-1DL master station offers effortless installation and comes complete with an affordable price to help save money.