Wireless: WTR-670 / WTR-680 / WTR-682 battery check
The battery condition on a WTR beltpack can be quickly checked by using the following procedure:
When the beltpack power is turned on by rotating the volume knob, the BAT/OM LED will flash once if the battery is good. If the red LED stays on, the battery is low. If the red LED does not flash at all, the battery is dead.