Two triggers and ... some lever on the back of the grip
I think the two triggers are for different fire modes - one for semi, one for full-auto. There's a few other guns that have that kind of setup, like the Beretta 38, but proper fire selectors eventually took over completely.
And the thing on the back of the grip is a grip safety - the idea is that you have to have gripped the gun properly in order to shoot it, if say something catches on the trigger without you having pushed that bit inside of the grip, it won't fire. This is a bit more common, the M1911 and the Uzi are two famous guns to have that mechanism (although theirs aren't so ridiculously big), but I think it's also fallen out of favor these days, outside of American boomers who think the 1911 is the end-all of pistol design.
I think the two triggers are for different fire modes - one for semi, one for full-auto. There's a few other guns that have that kind of setup, like the Beretta 38, but proper fire selectors eventually took over completely.
And the thing on the back of the grip is a grip safety - the idea is that you have to have gripped the gun properly in order to shoot it, if say something catches on the trigger without you having pushed that bit inside of the grip, it won't fire. This is a bit more common, the M1911 and the Uzi are two famous guns to have that mechanism (although theirs aren't so ridiculously big), but I think it's also fallen out of favor these days, outside of American boomers who think the 1911 is the end-all of pistol design.