Gyro plus accelerometer with a Digital Motion Processor that fuses them on-chip, so you get a stable orientation without writing a Kalman filter at two in the morning.
Specifications
| Gyroscope range | +/-250 to +/-2000 deg/s |
| Accelerometer range | +/-2 g to +/-16 g |
| Interface | I2C (0x68/0x69), up to 400 kHz |
| Extras | On-chip DMP, temperature sensor |
| Operating voltage | 3.3-5 V |