CT-A1 Indoor Sounder The CT-A1 Sounder is an indoor sounder that installs in a single-gang electric box. Works in conjunction with both CT-2B and CF-2C control units. Three Buttons On Plate interact with lights and sensor when used with the CF-2C control unit: “ON”: Puts lights on timer “RESET”: Turns lights off if they have not timed out “EXIT”: Turns sensor probe off so car can pass by and not trip the system (if late p.m. or early a.m.) (Note: these three buttons are non-functional when used with the CT-2B control unit.) • Full function with added features • Mounts in single-gang elec. box • Triple zone allows multiple monitoring • Decorative cover hides screws • Three tones: steacly, fast-pulse, slow-pulse • Screw terminal hook up • Volume control with muting • Includes set of screws