Specifications:

Speaker

Driver: 40 x 70mm / 1.5W x2 @4 ohm

Power Supply: 4 x AA Battery ( 6V )

Battery Life: max. over 100 hours

Function Control: Power on/off

Backpack

Color: Red, Yellow, Blue / Black

Size: (HxWxD) 47x27x12cm

Fabric: 600D Nylon Dobby

Lining: 210D PU Coating/ Black

Tape: PP Black

Zipper: Nylon Regular    

Foam: EVA & PE Foam

Buckle: Plastic / Black Regular

Capacity: 20 L

Features:

Superior class-D digital amplifier.

Unique water proof speakers hide in the straps.

Back padding and airflow channels for cool comfort.

Mesh pockets design

Front elastic strings for extra objects carrying

MP3 player holder pocket

Safety light refection bar