Four alarm modes: sound, light, vibration and display are activated simultaneously, and you can also set a certain alarm to be turned off. Real time curve display, more intuitive magnetic field changes. Applications: This device is designed to monitor ambient electromagnetic radiation levels to help users identify and avoid overexposure. Typical applications include: This device is used to measure electromagnetic radiation in a variety of environments, including living spaces, offices, computer rooms, distribution rooms, and near transmission towers. Color: As Shown Material: plastic Package Contents: 1 x EMF Meter 1 x cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.