Usage Tips:3 types of laser positioner to choose from red dot, horizontal line, horizontal & vertical line. Laser head is easy to install and use, it provides 650nm wavelength and adjustable focal length. This product is for locating, not for engraving. It's suitable for DIY lover, CNC engineer, artist and etc.. Features: Laser head with adjustable focal length. This product is for locating, not for engraving. Made of premium quality material with great durability, long service life. 19cm 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: 1. Please use heat dissipation equipment as much as possible for high-power lasers. 2. It's not suitable for continuous operation for a long time. 3. Size and color may be slightly different because of manual measurement and different light conditions. Thanks for understanding. Specifications: Positioner Type: Red dot /Horizontal Line/Horizontal & Vertical Line (Optional) Color: Silver Material: Metal Wave Length: 650nm Optical Power: 200-250mW Voltage: DC 3-4.5V Current: