USB wireless engraving: Our cordless engraving pen can be or connected to a power supply, and is equipped with a Type-C charging cable for quick charging. Can be to 80% in 30 minutes and fully in 1 hour; The long-lasting battery can be used continuously for 1 hour under normal circumstances, and it can be used while charging. The LED lighting lamp can illuminate the deep gap. Portable & Easy to Operate: Precise grinding engraver are made of durable and aluminum, only 12.7 cm/5in long and only 51g/0.11lb in weight. The ergonomic design of the pen body provides you with precise fingertip control, and you can take it anywhere, so that you can enjoy the easy time of hand-drilling jewelry making. A one-key switch adjusts the rotating speed, and there are 3 gears in total, the speed of 1-3 gears is 5000-10000-20000 Rpm, Overload Prevention: This DIY electric engraving pen is equipped with power indicator, speed indicator and overload indicator. You can know the usage of lettering pen in real time, and you can adjust your desired working speed according to different usage. In case of excessive resistance, the overload indicator lights up, and the power supply is automatically cut off for self-protection, to avoid motor damage and prolong the service life. Lower Noise: The metal engraver pen kit adopts 360 vacuum self-locking design, high concentric motor, grinding without shaking or burning, and the new technology has built-in locking ring, which can be plugged in and used without tightening. When working, the sound is very low, so don't worry that it will affect your family's rest, so that you can enjoy the relaxed time of making handmade diamond jewelry. Widely Used: Jewelry engraving machine includes 1 engraving pen, 4 templates (including numbers/letters/symbols/graphic templates), 30 engraving drills, 3 saw blades,1 connecting rod, 2 drills, 1 ceramic grinding head, 1 USB-Type-C charging cable and instructions, which support you on metal, glass, ceramics, leather, wood, jewelry, stone or statue. Color: As Shown Material: metal Package Contents: 1 set x engraving machine 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.