CrazyF411 AIO Toothpick Flight Controller + Receiver (20A ESC, OSD, Frsky RX)The CrazyF411 from Happymodel is an F4 toothpick flight controller with OSD, that also managed to include 4x 20A ESC and a Frsky compatible receiver built into the board, making this flight controller ideal for a very compact and lightweight toothpick build. The receiver also includes a PA LNA power amplifier to enable much greater range compared to some other flight controllers with built in receivers (up to 400m range). Features 25. 5x25. 5mm FC AIO