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The 3112 audiophone incorporates a 3 level electronic call tone input, lock release button and spare service button. It also includes a mute switch for the electronic call tone input. For use on traditional 3+1 and 4+1 audio systems including 4K series, 8K series, VR4K series and VR120 series audio kits.
2 button 3000 series audiophone with electronic call tone with mute switch