650nm 250mW Red Laser Line Locator Laser Head CNC Engraver Focusing Module Laser Ray Locator Adjustable Focal Length Laser Engraving DIY Part Horizontal & Vertical Line Laser Point Laser head with adjustable focal length. This product is for locating, not for engraving. Made of premium quality material with great durability, long service . Designed for engraver, suitable for DIY lover, engineer, artist and more. red is positive, black is negative. Compact and lightweight, easy to assemble, convenient to use. 3 types of positioner to choose fromred dot, horizontalline, horizontal&verticalline. Specifications: Length: 650nm Head Size: 12 * 44mm / 0.47 * 1.73in (Dia. * H) Item Weight: 18g / 0.62oz Material: Metal Current: <350mA Wire Length: 19cm / 7.48in Voltage: 3-4.5V Optical : 200-250mW Color: Silver Wiring Method: Red is positive, black is negative (XH2.54, the triangle mark is positive) Package Weight: 52g / 1.83oz Package Size: 16 * 6 * 5.5cm / 6.30 * 2.36 * 2.17in Positioner Type: Red dot /HorizontalLine/Horizontal&VerticalLine (Optional) 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, engineer, artist and etc.. Package List: 1 * Head