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Electromagnetic waves propagate through empty space at the speed of light, ie, 300 000 kilometres per second, and include the light that enables us to see, which vibrate at frequencies of about 1014 cycles per second. They have both an electrical component and a magnetic component vibrating at right angles to each another.

The entire electromagnetic spectrum is extremely wide, ranging from waves that vibrate at less than one cycle per second, or one Hz (Hertz) – named after Heinrich Hertz, the German physicist who discovered electromagnetic waves in 1888 – to 1024 Hz. The corresponding range of wavelengths – speed/frequency – is from 3 x 108 metres to 3 x 10-15 metre.

http://emfnews.org/Lifewave-Cellphone-Matrix-Shield-Test.html