GY-50 L3G4200D 3-Axis Gyroscope Sensor Module is an angular velocity sensor board which contains a 3-axis gyroscope, providing you with very high resolution (16 bit) measurements at up to 2000 dps. The gyroscope measures how much the device is rotating around all three axis, the range is user selectable and so can be adjusted to suit your application. The module outputs data over either I2C or SPI. If you choose to use the device in I2C, there are handy soldering jumpers available on the board to choose the address.
GY-50 L3G4200D 3-Axis Gyroscope Sensor Module also features a 32 count first in first out (FIFO) buffer, allowing you to request the data in batches, rather than having to constantly query the device. This frees up processor cycles for more calculations, whilst still maintaining a high bandwidth