Why does my Trevi RR 501BT radio work with AC power but not with batteries?
Based on the Trevi RR 501BT user guide, there are a few specific things to check if your radio works on AC power but…
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trevi RR 501BT Portable Radio User Guide — questions & answers
Read product questions and troubleshooting answers linked to trevi RR 501BT Portable Radio User Guide.