Smart Lock USB. Use Magnet Polarity to Unlock and Lock Usb.
So many type of usb, and so many uses of usb. Fan, lights, air conditioner, hand warmer, drill, and many tools now is using this small usb!. Now, i will make something special from usb. Everyday i use usb plug from my pc, but the usb plug is to far from me, so i make this usb extension....By: balsuryana
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