A small sensor module that includes an HMC5883 sensor. It a 3-axis magnetometer/compass that uses the widely know I2C protocol. On the PCB you will find a clear indication for the voltage range, the sensor name for quick searching, the read and write I2C addresses together with the pin out labeling. On top of those, a graphic representation of the sensor measuring values gives a better understanding of what you should expect as an output.

Using the onboard low dropout regulator (an LDO made by Microchip) the module can work under a wide operating voltage range - from 3V all the way up to 6V!

For more info about this sensor module and more have a look here: http://embeddedday.com/projects/sensor-modules/

If you are interested for the full pack of the Sensor Modules have a look here: Sensor Modules Full Pack