Cordless Electric Mini Drill Grinder Engraving Pen Variable Speed Rotary Tool

USB Power Charging:  This electric jewelry drill powered by USB interface, it can meet your outdoor using after finishing charging.It can also be used while charging, but we suggest you to use after charging to extent battery using life. Power-off Protection:  When etching tool encounters great resistance, it will shut off automatically to protect itself to extend using life.Then you just need to press ON/OFF button to start working again. 3 Speeds Selection: These electric engraving pen can adjust speed from 5000 to 25000 r/min. The lowest speed will let you polish your nails safely, the highest speed will work on a metal surface. Application:  Suitable for all kinds of stone carving, wood carving, olive carving, plastic carving, egg carving, glass carving, ceramic carving, drilling and all kinds of metal surface grinding, engraving, trimming, etc. Begin Engraved Art Now:  This portable and compact etching pen is convenient to take anywhere you want and allow you enjoy relaxing hand drill jewelry making time. It can work on metal, glass, ceramic, leather, wood, jewelry, stone or statue. Great Gift Choice:  Well packaged, it is a perfect gift! Note It must be fully charged before the first use. Power source USB charging Power 25W Voltage 3.7V Speed 5000-25000r / min Clamping Diameter 2.35mm (Suitable for all 2.35MM specification grinding head, reducing drill etc) Size Approximately 125x16mm / 4.92x0.63 inch Power Display 1 light = 30% power 2 lights = 31% - 70% power  3 lights = 71% - 100% power Package Includes 1 x Wireless Electric Grinder 1 x USB Charging Cable 2 x Drill bit