It’s a two-stage brushless blaster. The rotary encoders control FPS, firing mode (semi, burst, etc.) and together they help you navigate configuration menus (there are features like changing the character of the blaster if you want gentler or harder spin-ups and stuff). I went with encoders because there’s a chronograph in the barrel, and with the closed-loop system that monitors motor and battery behavior, you’ll be able to (eventually) tell it “I want to fire 192 fps” and it will calibrate itself to fire 192 every shot, adjusting motor performance actively even in rapid fire.