The SR-1 Single Line Loud Ringer from Viking Electronics works on any analog C.O., PABX or Key system line and is triggered by sensing ring voltage on the line. The user can select from four ring tones. The unit is self-contained in a wall-mount case and includes a test button and volume control. An external 8-ohm speaker can be added for remote areas. The unit also has an input for a dry contact closure activation that initiates a chime sound. Viking Electronics

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