Max Output <5mW, Wavelength 650nm-660mm, Class II Laser Product We can. ll hit the bulls eye every time, but you'll definitely be a force to reckon with when you use the Viper Laser Dart Throw Line. This high tech accessory will project a concentrated beam of light to indicate where you should be standing. The adjustable laser light allows you to place the line at any height, and you can project it to any distance. Mounting your laser is quick and easy on any wall your dart board sits on with the included mounting hardware. Sticky throw lines are a thing of the past with the Viper Laser Dart Throw Line!