This SpeedyBee F405 V3 BLS 3 - 6S 30x30 Stack/Combo is perfect for hobbyists and enthusiasts who love RC quadcopters. It comes with a flight controller and an ESC that work together seamlessly. The flight controller has features like an onboard battery life indicator, a Micro - SD card slot for Blackbox logging, and built - in Bluetooth for easy wireless configuration. The ESC has a built - in TVS protective diode and Japanese made TDK SMT capacitors. The stack has a mounting size of 30.5 x 30.5mm with a 4mm hole diameter. The flight controller weighs 9.6g (41.6(L) x 39.4(W) x 7.8(H)mm) and the ESC weighs 13.8g (45.6(L) * 44(W) * 6.1mm(H)). Ideal for getting the most out of your RC flying experience.