Recently, many studies have delivered warnings about long-term exposure to cell phone radiation and certain electromagnetic fields. But since these dangers can't be seen by the naked eye, how can you protect yourself and your family? The CellSensor EMF Detection Meter measures both of these hazards with an easy-to-read gauge that also beeps and glows when high readings are detected. The CellSensor runs on one 9-volt alkaline battery (sold separately).Up to 20 percent of all homes are covered in "hot spots" of electromagnetic fields over 2 milligauss. While it is safe to be in such a hot spot for a short time, it is not advised to spend long periods in them, such as your sleeping hours. Most of these spots are small, so by locating them, you can move your furniture safely out of these zones. A comprehensive guide is included to explain the source of mobile phone radiation and the extremely low frequency electromagnetic fields generated by electrical currents from power lines, home wiring or appliances. In only minutes, you'll be able to detect these dangers. Additional features include a flattened frequency response curve in ELF mode for increased accuracy. Note: Studies that indicate that RF radiation from mobile phones and ELF fields emitted by electrical sources are hazardous to your health are not supported by other studies and can therefore not be characterized as proven.