source. While the 3.5mm audio cable is connected, Bluetooth audio
output is disabled.
7. Charging B-TREK S2 speaker
To charge the B-TREK S2 speaker, connect the micro USB cable to
the B-TREK S2 and plug the speaker into a USB power source. USB
power sources include computers, laptops, USB hubs, USB AC
adapters and USB car chargers.
When the B-TREK S2 is charging, the red light will be lit. When
the battery is fully charged, the light will turn blue. The charging
process can take 5 to 6 hours to charge the battery completely.
When the B-TREK S2 has a low battery and it is powered on, the red
light will blink once every ten seconds.
