4000mAh Built-in Battery - The Head fan will last for 6-12 hours even in the absence of sunlight,and never stop working if under the sun
The Built-in battery has USB output interface,which can be used as portable charger
Solar charging,Head fan,Head lamp,USB output,Bluetooth Answering Phone Function
With a screw and strap to adjust the head circumference for proper fit and avoid slipping
Hollow thermal insulating layer desi
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