Universal Battery Boost for smartphone

Universal battery boost for smartphone.
It Requires 4 AA batteries standard 1.5 volt or rechargeable 1.2 volt.

You mast have:
• 4 magnets: diameter 5 mm - height 3 mm
• 1 Battery holder with wires for 4 AA batteries
• 2 usb male cable
• 1 usb female type A connector

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