Press the arrow buttons

David pressed the buttons, and suddenly the blue lighting emerging from the tip of the gun turned green. It seemed to have changed the bullets inside the gun. David pressed the button again though, and it turned to a red light. Upon pressing it one more time, the light went back to the same blue. Three options. The blue was obviously not the correct one, but maybe one of the other colors fixed this? Then again, what did the 3rd color do? Fuck, decisions. David hated decision making, especially in dire situations like this.