Here is what they have to say about their product:

The Defi-Link Indicator is a warning indicator which can be connected to each Defi-Link Meter, Defi-Link Meter BF, and Defi-Link Display. By connecting this product to Defi-Link Control Unit II, it can be used as a "Master-Warning" indicator. It blinks as a warning signal for all the connected gauges and displays.

This product is designed for Defi-Link Meters, Defi-Link Meter BFs, and Defi-Link Displays.

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