The CCS-1A is a chime com 2 set, 1 master, 1 door system from Aiphone which is capable of providing a high performance intercom system for many applications. The CCS-1A chime set comes with a press and talk button for door answering, an automatic timer for shut off, an electronic 2 tone chime call in, as well as an inside 2nd room station, and a backlit call button. The CCS-1A chime com set also features voice and chime volume controls, an AC transformer power supply (PT-1210N) (not included), and offers a call button and mic/speaker functions. This chime com set is user friendly, and comes at an affordable price to help save money.