Feature:1. SAFE AND RECHARGEABLE: The metal carving tool is rechargeable and comes with a USB charger. Miniature engraving pen built in safety protection circuit board and intelligent overload protection chip. When the working resistance is too large, it will automatically cut off the power to prevent damage to the letter pen, very safe to use2. LOW NOISE WITHOUT DISTURBING: This electric engraving machine works with low noise. Don't worry about affecting rest of your family3. PORTABLE AND EASY TO USE: The body is light and compact, you can easily carry. Super easy to use, perfect for beginners or professionals, allowing you to customize everyday items and create one of a kind personalized accessories and gifts4. ADJUSTABLE SPEED: Working power up to 10W, 3 speed, can be adjusted in the range of 500018000 r/min, suitable for different materials. The improved high performance 18000RPM motor provides better control and handling than many other motors on the market5. LIGHTWEIGHT ALUMINUM: Lightweight aluminum frame and ergonomic grip give you accurate fingertip controlSpecification:Item Type: Mini Electric Engraver Etching PenMaterial: Stainless steelBattery: 1 x 5V 10400 Rechargeable lithium battery, Battery Capacity: 320mAhMotor Level Speed: 5000RPM in 1st level; 10000RPM in 2nd level; 18000RPM in 3rd level.Package List:1 x Grinding Pen30 x Grinding Head1 x Charger1 x Hex Wrench16 x Carving Template1 x Connecting Rod3 x Saw Blade1 x Storage BoxNote:Please allow 12in error due to manual measurement. Thanks for your understanding.