Laser Modulation and Wiring

I’m curious as to how the laser power settings relate to the actual laser power. I notice that in the Moai 130 settings, the laser can be set to powers up to 200. I am curious about what these values relate to. Are they a percentage of an analog signal? maybe a portion of an 8-bit PWM signal? Normally laser power is regulated through either analog or TTL signals. I am assuming that because the moai laser module has 4 wires it uses one of these regulation methods?