Non-blowback, or NBB, guns are powered by gas but have little to no moving parts. This makes them cheaper to make, and more reliable - the less the moves, the less that can go wrong.
This model is a Co2 powered (sold separately) pistol nickamed the Baby Desert Eagle. The real steel gun itself, the Jericho 941, is manufactured by IMI and although visually it looks like a Danny DeVito Desert Eagle, it bears no functional similarities. It is rather based off the CZ75, and simply marketed as the Baby Desert Eagle by Magnum Research.
The airsoft replica maufactured by KWC is constructed out of durable ABS plastic, and runs off the 12g Co2 caplets. Each cannister lasts approximately 150-200 shots, with the magazine holding 15rds at a time. The slide is fixed meaning it doesn't move at all - instead the barrel is brought back toward the magazine to fire. As such it is extremely important to never hold the trigger and insert the magazine - doing so will damage and break the gun. Remember to only use high quality BB's, and never reuse them!
On the underside of the pistol is a 20mm RIS/RAS rail allowing you to add on a laser or torch to make the gun a little more tactical.