Here are a few articles / documents you may find interesting / useful!

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How to Re-Sync your GC500

If you update the calls on your GC500 SD Card, or you find your remote is not “talking” to the base unit then you need to re-sync the remote with the base unit.

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How to get the most out of your Electronic Caller

Using an electronic caller is not a “fix all” magic solution – there are lots of things you can do to improve your chances of calling charlie…