The DBS-1A is a 1 master, 1 door DB series kit from Aiphone which consists of the PT-1211C, DB-1MD, and DA-1DS. The DBS-1A master/door kit comes with a call button with 5 stations, an internal VOX hands free communication operation, receive volume control, backlit directory, a call extension sounder, as well as 2 wire connection, a mute call volume w/ indicator, and a door release. The DBS-1A 1 master/door kit is user friendly, easy to setup and install, and offers an affordable price which can help save money.