Features 1、The speed range is 3000/6000/9000/12000/15000R/min (revolutions per minute), which can easily control the engraving/drawing route. 2、In general, the speed of metal and wood is lower, and the speed of glass and ceramics is faster. 3、Hold it easily and comfortably, just like a pen, you can perform complex tasks without excessive pressure on your wrist or hand. 4、The DIY vibration engraving pen set is suitable for metal, glass, nails, plastic, wood, leather, etc. 5、This electric engraver pen is suitable in engraving, polishing, trimming, etc. Specification Item Type: Mini Engraving Pen Voltage: 3.7V Speed Range: 3000/6000/9000/12000/15000R/min Power Supply: USB charging Battery: 2000mAh Lithium Battery(Built-in) Scope of Application: Carving, polishing, trimming, etc. Package List 1 x Host 40 x Grinding Needle 16 x Engraving Template 4 x High Speed Steel Saw Blade 5 x Drill Bit 2 x Connecting Rod 6 x Matte Sheet 2 x Sponge 5 x Drill Clamp 1 x Charging Cable 1 x English User Manual