-Compatible with any telephone system with standard DC message waiting voltages ranging from 90VDC to 120 VDCFully modular for quick plug-in installation by non-telephone personnelUnit's LED will blink at a steady rate when the message waiting voltage is detected.Flickers when the phone ringsAttractive stylingEasy retrofit mountingWorks with nearly all message waiting voltagesNot compatible with any AT&T phone system BRAND : VIKING SKU : VK-LM-1A UPC : 615687222142
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