TWR Lighting - Obstruction Lighting Alarm Converter 1 Beacon - 4 Obstruction Lights (This item has been discontinued) Alarm Converter 1 Beacon - 4 Obstruction Lights Description - Alarm Converter - For 1 Beacon and up to 4 Obstruction Lights TWR Obstruction Lighting Alarm Converter 1 Beacon - 4 Obstruction Lights