Hobbypower Pixhawk PX4 Flight Controller NEO-7M GPS 433Mhz Radio Wireless Telemetry OSD Module PPM Module I2C Splitter Expand Module Power Module for FPV Multirotor 32 bit 2M flash memory STM32F427 Cortex M4, with hardware floating point processing unit Main frequency: 256K, 168MHZ RAM 32 bit STM32F103 backup co processor L3GD20 3 axis digital 16 bit gyroscope LSM303D 3 axis 14 bit accelerometer /magnetometer