It has a green coloration with red trim at the barrel, and a glowing yellow light next to the keypad and screen.
It is similar in design and shape to the Compliance Regulator. When the laser is aimed at a nuclear warhead, it causes it to heat up, eventually leading to the chemical explosive inside detonating, scattering radioactive material around. It fires a series of coded pulses of visible red laser-light similar to a laser designator and therefore dealing does not deal any damage.
The laser detonator is a detonator powered with microfusion breeder and using laser illumination to trigger the nuclear warheads found around the Divide.