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The message waiting lamp retrofit kit is compatible with any telephone system with standard DC message waiting voltages ranging from 90VDC to 120 VDC. The LM-1A is fully modular for quick plug-in installation by non-telephone personnel. The units LED will blink at a steady rate when the message waiting voltage is detected. The LM-1A will also flash when the phone rings, helping to reduce noise in quiet areas by providing a convenient visual indication for ringing or message waiting. Notes: 1. The LM-1A is not designed to recognize stutter dial tone from any analog telephone company phone line or PABX. 2. The LM-1A is not compatible with any AT&T phone system.