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2. Emergency radio - Wikipedia

   en.wikipedia.org/wiki/Emergency_radio

   Common to all emergency radios is the need to maintain power as long as possible in times of power failure. Commonly, such radios are designed to use minimal battery power, and a common feature (especially on units sold in less-developed countries where electrical supplies may be unreliable or nonexistent) is a hand-cranked electrical generator ...

3. Batteryless radio - Wikipedia

   en.wikipedia.org/wiki/Batteryless_radio

   A batteryless radio is a radio receiver which does not require the use of a battery to provide it with electrical power. Originally this referred to units which could be used directly by AC mains supply (mains radio); it can also refer to units which do not require a power source at all, except for the power that they receive from an ambient ...

4. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   Portable radios may have an arrangement for powering from an outlet, conserving the batteries when an outlet is available. Portable "emergency" radios may be solar and/or hand crank powered. [7] Boom box - a portable battery-powered high fidelity stereo sound system in the form of a box with a handle, which became popular during the mid-1970s.

5. List of radios - Wikipedia

   en.wikipedia.org/wiki/List_of_radios

   It was designed by G.D. Reynolds of Murphy Radio. Both AC and battery-operated versions were made. [7] [8] [9] Walkman – The original Walkman, released in 1979, was a portable cassette player. The Walkman brand was later extended to serve most of Sony's portable audio devices as well as related media devices, including radio receivers.

6. Philco - Wikipedia

   en.wikipedia.org/wiki/Philco

   Until the mid- to late-1920s, all radios except crystal sets were powered by vacuum tube batteries which were expensive, needed frequent charging, and leaked battery acid, reducing the wife approval factor in the home. A very successful August 1925 Philco consumer product, called the "Socket Power Battery Eliminator", was a rectifier unit which ...

7. NOAA Weather Radio - Wikipedia

   en.wikipedia.org/wiki/NOAA_Weather_Radio

   Hand-held battery powered radios, suitable for use by hikers, boaters, and in emergency preparedness kits. Hand-crank portable radios that do not require AC or battery power, especially designed for use in emergency preparedness kits. Weather radio receivers integrated as an auxiliary function into other devices, such as GMRS radios, portable ...