Wow! Did you score a deal! You stole those things! 
With regard to The Handler, there isn't much to know about it. It's a fixed voltage transformer with four outputs. They are set at 12, 14, 16, and 18 volts and plainly labeled. You've got RED and BLACK terminals for each output, and a circuit breaker on each output. I think the outputs are rated at 10 amps each. This is a BIG power supply that could run all your lights and accessories.
Lou Neiderlander was the guy who designed this and he's on this forum. I'll send him an alert.
