This item is a necessary accessory for DIY engraving machine. It is a professional laser- with high speed and high stability. Professional laser- with high speed, high precision and high stability. Bright violet light, easy for locating when engraving. Adjustable laser-, easy to adjust, engraving with and high efficiency. Can be used to engrave bamboo, leather, cut paper, PCB or other materials. Suitable for DIY engraving machine, easy to install. Material: brass Color: yellow Light Color: Violet Power: 1500mW Wave Length: 405nm Input Voltage: 4.5-5V Diameter: 12mm Laser Working Temperature: 500 Celsius Item Size: 1 x 4.5cm / 0.39 x 1.77in(D x H) Item Weight: 36g / 1.3oz Package List: 2 x laser- 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.