Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information, such as sound, is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form. Here at Outdoor Shopping we carry Multi-Purpose Solar-Powered Digital Weather Radios as well as digital tuning radios just to name a few. Multi-Purpose Solar-Powered Digital Weather Radios and great for all your outdoor needs, from a bright led light to cell phone charger and powerful crank, these radios really have it all! Come see why Outdoor Shopping is trusted for all your Outdoor Needs. Commonly referred to as solar emergency radio, emergency flashlight radio, noaa emergency radio, camp radio, handheld radios, and portable radio. Great for trucks, cars, handheld, hand free, communication, multiple use, walkie-talkie, portable, mounting, multiple channels, am and FM frequencies.