The BATTERY indicator blinking red means, a charging error is going on.
If any condition below happens, the WL-50 might pause charging to protect the rechargeable lithium-ion battery.
- Transmitter’s internal temperature rises.
When the internal temperature falls, the BATTERY indicator lits orange again, and charging resumes. Remove the transmitter from the receiver and wait a while without using it. - The room temperature is above 35°C (95°F).
Use the unit in the recommended ambient temperature range of 10–30°C (50-86°F).
If the above measures do not help, the unit may be faulty. For more repair information, contact the distributor at which you purchased the product or our customer support in your area.