<p>This product is a blue laser with a wavelength of 450nm, belonging to the blue spectrum.</p> <p>4.5W high-precision laser head, real light power.</p> <p>Adjustable focal length, can be adjusted to the appropriate spot size according to the working distance can support engraving on a variety of materials, such as stainless steel, acrylic, wood panels, leaves and so on.</p> <p>Adopt spot compression technology to make the laser beam with higher energy density and stronger focusing effect.</p> <p>Control signal voltage:2.5V-5V</p> <p>Control mode:PWM</p> <p>Modulation response frequency:Less than 2KHz</p> <p>Spot Mode:Spot</p> <p>Focal length:50\u00B11mm\/adjustable</p> <p>Operating temperature:0\u2103-35\u2103</p> <p>Focus size:Less than 40x400\u03BCm</p> <p>Operating voltage:12V</p> <p>Due to different batches, there may be differences in product appearance and printed text, which will not affect use.</p> <p>Colour:Black</p> <p>Material:ABS</p> <p>Package Contents:</p> <p>1 * laser module</p> <p>Only the above package content, other products are not included.</p> <p>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.</p>