Description Product Reviews Optex RC-20U 3-Channel Receiver Chimebox with Relay The Optex RC-20U 3-Channel Receiver Chimebox accepts up to 9 transmitters and distinguishes each group of three with a unique chime tone, making it easy to identify alerts. This device operates on a 9V DC adaptor, which is included for your convenience. Designed for versatility, it can be mounted on a wall or placed on a table to suit your space. Enhance your alert system with this reliable and user-friendly chimebox. Order the Optex RC-20U today and experience efficient notification management. Main Features Accepts 9 transmitters, identifies each group of 3 with a different chime tone Operates with 9V DC adaptor (included) Wall mount or table mount design Whats Included RC-20U Doorbell Power Adapter 1 x Mounting Screw 0 Reviews Hide Reviews Product Reviews