Hummingbird 255 AIO Flight Controller AT32F435 AM32 50A 3-6SHummingbird 255 AIO FC AT32F435 + AM32 50A 36S The Hummingbird 255 AIO is your all in one ticket to a cleaner, lighter build without compromising power. With an AT32F435 flight controller brain fused to a 50A AM32 ESC, this 36S unit is designed for serious freestyle and race rigs that want fewer wires and more reliability. Basically, less stack faff, more stick time. (Wallet wink: yes, one board is easier to replace than two.) Why You Want It Stacks