100% Brand New. Arduino Compatible Comes pre-soldered and tested Includes 3-axis gyro, accelerometer along with a high-performance barometer External Compass (Optional) Onboard 4 MP Dataflash chip for automatic datalogging Optional off-board GPS, uBlox NEO6 (select GPS option from options) One of the first open source autopilot systems to use Invensense's 6 DoF Accelerometer/Gyro MPU-6000. Barometric pressure sensor upgraded to MS5611-01BA03, from Measurement Specialties. Atmel's ATMEGA2560 and ATMEGA32U-2 chips for processing and usb functions respectively.