The diode head should not normally be disconnected from the driver board (the diode is very sensitive to static and any accumulated charge in the power supply).
Power should be supplied via the red and black cables. The green socket gives optional TTL control (connect the wires together to blank the laser).
Customer ratings for 50-80mW Wide Beam (15mm) 532nm Green Laser Module with TTL Modulation and Fan Cooled Laser Head (12V) (G50C)
Number of ratings: 1
Average rating: 5
Excellent from Anonymous on 29/10/2015
Nice thick visible beam at night, and indoors. All cables nicely labelled on the driver board, and the fan does not seem to need to kick in very often as the aluminium housing keeps the laser cool.