Model: -273 : HMC5883L Communication: IIC communication protocol Measuring range: ± 1.3-8 gauss Specifications: Power supply :3-5V Size: 1.8 x 1.3 cm Net weight:17 g Material: Electronic component colour: blue Package Contents: 2 x Magnetometer Sensor Module Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.