Turnigy 9xr PRO Radio Transmitter Mode 2 (Without Module) ARM version of er9x radio firmware with EESKYE simulator GUI support 24 channel support 48 available mixes Atmel SAM3S ARM Cortex M3, 32-bit Micro-controller, 512K flash, 64Kb of SRAM 4Mb EEPROM for Storing 30 Models