How to charge the HT3831 earbuds?

When the earbuds’ battery is low, you’ll start hearing “beeps” three times per
minute and the LED will flash green rapidly. Please charge the earbuds when
this happens. There are 2 ways to charge the earbuds.

Option 1,Charging via the transmitter & dual charging dock

While the transmitter and the dual charging dock are connected to power,
place the earbuds back into them. The charging indicators will turn red while
charging. Once fully charged, they will turn green.

Option 2,Swapping in the spare battery

The HT3831 set comes with an extra battery. Simply swap in that extra
battery, and insert the drained battery into the battery charging dock to
charge.

The indicator on the front side of the transmitter dock will turn red
when the battery is charging and turn green when the charging is complete.