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The Swiss flag image is for swiss made identity and the screw shape is easy to hold and unslippery
swiss screw with magnet powered LED. It employs a coil, traveling magnet, and capacitor as a power source, shaking the screwdriver charges the capacitor which powers the LED. This design is for bad lighting enviroment.
It requires about 30 seconds of shaking for about 20 minutes of light.
National Cheng Kung university
cloud on field
Kaohsiung county, Taiwan