1、Laser head with adjustable focal length. This product is for locating and engraving. 2、Made of premium quality material with great durability, long service life. 3、23.5cm long wire for flexible use. Wiring method: red is positive, black is negative. 4、Compact and lightweight, easy to assemble, convenient to use. 5、Designed for CNC laser engraver, suitable for DIY lover, CNC engineer, artist and more. Laser head is easy to install and use, it provides 405nm wavelength and adjustable focal length. This product has locating function and laser engraving function. It's suitable for DIY lover, CNC engineer, artist and etc. Features: Laser head with adjustable focal length. This product is for locating and engraving. Made of premium quality material with great durability, long service life. 23.5cm long wire for flexible use. Wiring method: red is positive, black is negative. Compact and lightweight, easy to assemble, convenient to use. Designed for CNC laser engraver, suitable for DIY lover, CNC engineer, artist and more. Note: Materials That Can Be Engraved: Wood, some plastic, paper, columns, cow horns, thin leather (wallet), rubber stamps, photosensitive stamps, printing paper, (only for engraving, can cut the material is relatively small), sponge paper and other easy to burn the material. Materials That Cannot Be Engraved: Metals (no matter how thin or thick), stones, ceramics, jewelry and gems, reflective materials, transparent glass, ivory, colorless and transparent materials, part of the white plastic (generally very smooth surface of the plastic is difficult to engrave). Specifications: Spot Shape: Line / Cross / Point (Optional) Material: Metal + Diode Wave Length: 405nm Optical Power: 500mW Supply Voltage: 4V Working Life: 8000 hours Laser Head Size: 11 * 45mm / 0.43 * 1.77in (Dia. * H) Wire Length: 235mm / 9.25in Item Weight: 16g / 0.56oz Package Weight: 21g / 0.74oz Package Size: 18 * 13 * 2cm / 7.08 * 5.12 * 0.78in Package List: 1 * Laser Head 1 * Laser Head