【USB Charging Wireless Engraving】-Our rotary-cutters cordless engraving pen is equipped with a Type-C charging cable, which is convenient for fast charging, fully charged in more than 1 hour, and a long-lasting lithium battery, which can work continuously for 2 hours under normal conditions. Cordless operation is more convenient, USB can be connected to various USB interfaces such as charging treasure, charging plug and so on.