The working power is up to 10W, there are three positions, and the speed is 10000-15000-20000 revolutions per minute. You can choose different speed on different occasions. The engraving pen has a power indicator light and an overload indicator light, and you can check the pen using condition in real time. The ergonomic handle provides extra comfort and stable control. The engraving pen has only one red button, easy to press and work. It will automatically shut off under high resistance, very safe to use. Product Name:Electric Engraving Pen Speed:10000-15000-20000 Power:10W Voltage:3.7V Battery capacity:380MAH Charging input voltage:5V2A Colour:As Shown Material:Metal Size:Fixture size:2.35mm,Chuck depth:25MM Package Contents: 1set * metal engraving tools Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.