It's a 3 man unit where 3 people can dive down up to 80 feet and stay down about 3 hours at a time. You can even add a fourth diver by just adding another airline,regulator and weight belt. It comes with 3 air lines 20 ft. each which then connects to a 60 down line. Included are 3 regulators, and 2 quick release weight belts (minus the weights) a dive flag, hard shell case for the motor/compressor,duffel bag to hold all of the air hoses, regulators and weight belts a large float for motor,compressor. This model has a Honda engine. If you go to www.Browniesthirdlung.com you can check out the Explorer 390. My hookah was the predecessor to the Explorer 390. I am the second owner of this unit. It has only used about 15 hours. lt sells for $3450.00 new. I'll sell for $1200.00 shipped. Money order is fine. No trades.