GY273 Sensor Compass Magnetometer HMC5883L Specification Supply Voltage : 3 ~ 5V Communication : Standard I2C Protocol Based on IC HMC5883L Measuring range: 1.3 ~ 8 gauss High Resolution HMC118X series Magneto Resistive Sensors Automatic Degaussing Strap Drivers Offset Cancellation 12 bit ADC ensuring 1 to 2 accuracy Low Power Consumption (100uA)