Inertial Measurement Unit (IMU)
From the manufacturer's website:
myARS-USB has a 3-axis acceleration sensor, 2-axis Gyro sensor, temperature sensor, and a 32 bit ARM Cortex-M3 microprocessor mounted together to find the roll-pitch angles. The ARS, short for Attitude Reference System, is the system that calculates the roll-pitch angle. Roll-pitch angles can be found using the UART, I2C, and USB interfaces with a 5V power source without the aid of additional components
myARS-USB is designed 15.4mm x 19.2mm miniature size to use variety project.
Product Page: myAHRS-USB