STM32F103CBT6 32-bit ARM Cortex M3 processor (72MHz, 3.3V)

Invensense MPU6500 MEMS accelerometer + gyro

BMP280 Barometer

Battery voltage monitoring

Built-in FrSky telemetry converter

SBUS Inverter

16mbit flash

Onboard USB for setup and configuration

Extra bright LEDs

Sonar pads w/resistors added for direct connection to 5V sonar

Spec :

Revision: 6B

Height: 36mm

Width: 36mm

Weight: 6 grams (no headers, 8 grams with)

Sensors: MPU6050, BMP280