TOA's S-04S T has 8 available tones, selected via DIP switches . The single tone activation with a switch closure across module screw terminals #3 and #1. The continuous tone activation with a switch closure across module screw terminals #2 and #1. Great for applications such as but not limited to: doorbell, paging, door/gate release, telephone night ringer, annunciator, class change or pre-announcement tone. Faceplate Controls: Gain, terminals to trigger tones; Noise: 80 dB; Available Tone: 1 tone chime, 2 tone chime, 4 tone chime up, 4 tone chime down, gong, Westminster, holding tone 1, holding tone 2; Connector: removable terminal block .