Skystars stack for smaller 2.5 - 4" drones powered by 3-6S Lipo batteries. The FC has a connector for easy connection of digital DJI FPV system, but also contains an OSD chip and can be used without problems on drones with analog video transmittion. The FC has 16MB of memory for blackbox, barometer, 5V and 10V BEC. The ESC can handle up the 35A of current and uses the firmware BlHeli_S.