Harman JBL Partybox - Power and Charging; Power On Procedure; Charging Options

Power on
1.
2.
Charging (PartyBox 300 only)
Fully charge the built-in battery before using for the first time, which will prolong the battery lifespan.
Built-in battery charging works on AC power only.
Press any button to check the remaining battery level when it is turned on.
Charging USB devices