Steren BOOM-100, Instruction Manual

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Connect the micro USB cable to DC 5V on the speaker and the other
end to a USB adapter to connect it to the electric current as shown in
the picture.
When the symbol indicator flashes, it means that you must charge
the battery.
When the charge is complete the symbol indicator will remain
switched on
Bat
ter
y c
har
ge
DC 5V
ON OFF
TF CARD
AUX USB
BATTERY CHARGE
Fully charge the speaker battery for 4 hours before use.
Do not leave the horn on for more than 4 hours; can affect
Negatively the life of the battery