In some cases, the green charging lights may go off (or fail to come on) even though your Embr Wave is charging properly! This may be due to a communication error between the indicator lights and USB port you are using.
We released a fix for this issue on April 17, 2019 (firmware version 35). If you're experiencing this issue and haven't updated your device since that date, open the Embr Wave app on your phone. The update should start downloading automatically within about 10-20 seconds. If it doesn't start downloading, tap the gear icon to open up Settings, and then tap Firmware.