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The S-04S from TOA Electronics is a switch-selectable tone generator module for 900 series amplifiers. It generates eight tones via switch-closure that can be used as doorbells, gate/door releases, class change signals, or pre-announcement signals. It has an adjustable gain and a 3-pin removable block connector.
In the Box
Toa Electronics S-04S - Switch-Selectable Tone Generator Module for 900 Series Amplifiers