This product is a blue laser with a wavelength of 450nm, belonging to the blue spectrum. 4.5W high-precision laser , real light power. Adjustable 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. Adopt spot compression technology to make the laser beam with higher energy density and stronger focusing effect. Control signal voltage:2.5V-5V Control mode:PWM Modulation response frequency:Less than 2KHz Spot Mode:Spot length:501mm/adjustable Operating temperature:0-35 Focus size:Less than 40x400m Operating voltage:12V Due to different batches, there may be differences in product appearance and printed text, which not affect use. Colour:Black Material:ABS Package Contents: 1 * laser module 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.