BRAINFPV PRODUCTS be free. get your stick time on. THE MOST ADVANCED DRONE RACING FLIGHT CONTROL SYSTEM EVER RACING EDITION 1 (RE1) BrainFPV RE1 (Racing Edition 1), is a high performance drone racing flight controller that has a fully integrated graphical On-Screen-Display (OSD). MINI POWER BOARD RE1 stacks seamlessly on its companion, mPB (Mini Power Board), to give you clean power and precise battery information. EXPLORE RE1 - BARO A barometer add-on for the BrainFPV RE1 flight controller uses a barometer to measure the pressure of the ambient air, from which RE1 then calculates the altitude.