POWER: The powerful 20000 rpm motor of the engraving pen is powered by only 2 AAA batteries and can engrave on metal, wood, plastic, leather, metal, ceramics and plastic.HIGH QUALITY: The engraving machine head (1mm) is made of high-strength diamond, which is super wear-resistant and impact-resistant, and has a longer service life. The body is made of aluminum. The compact engraver has an ergonomic tri-lobal grip and precise fingertip control. EASY TO USE: Hold the DIY engraver pen like a pencil with your thumb over the control button, applying light pressure to the surfaces. DESIGN LIGHTWEIGHT AND ERGONOMIC: Cordless Engraving Pen Small in size, lightweight and easy to carry, you can hold the precision carving engraving tools like a pen to do intricate work without undue stress on your wrist or hand. BATTERY CHARGE: The mini engraving pen is portable. Electric Engraver Pen Pocket clip design is convenient to carry. Due to delivery safety, there is no battery (should be AAA) inside.Specifications:Size: 6*0.6*0.6 inchModel: IM-412Rated input power: AAA battery (W) No-load speed: 12000 (rpm) Piston stroke length: 0.08 inch Baseplate diameter: 0.08 inch Number of revolutions: 12000 (rpm) Power type: two AA batteries Rated voltage: 1 (V