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Adjustable speed: This electric engraving pen has 3 gears with adjustable speed (5000 rpm, 10000 rpm, 18000 rpm) to apply different situations. With the lowest speed, you can polish your nail safely, the highest speed works even when metal carving. This compact etching pen is convenient to take anywhere. USB rechargeable and intelligent shutdown: the engraving device is rechargeable via a USB interface. When fully charged, wireless use can last up to 60 minutes depending on the power speed.

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