The transistor!
You can find ratings for the best portable radios and the largest selection at bestbuy.com in the section Portable Radios and Pocket Radios, listen to your favorite stations.
Two way radios were invented as a means of portable, man carried communication.
Most people rate Sony portable radios with 4 to 4.5 stars. This concludes that Sony portable radios are well liked and preferred. You can read reviews of the portable radios on most sites where you can purchase one, including amazon.com.
Yes portable radios pick up the same stations as a regular radio there just portable instead of having to be plugged into a wall outlet.
Motorola offers some of the leading portable radios on the market today. Many of Motorola's portable radios are used by emergency personnel in the most extreme environments. High quality Motorola portable radios range in price from around $100 to more than $1300 for some of the highest quality portable radios.
Kenwood portable radios are radios which allow you to speak with people up to 5 miles away. They are very durable but can also be a little bit pricey.
Portable radios that are small in size and that offer both AM and FM radio which charge by usb are available. You can find them online by visiting http://www.alibaba.com/showroom/usb-charge-portable-speaker.html which offers some selection on these sorts of portable radios. Some retail stores could possibly also help you find the types of portable radios you are looking for.
From my experience, most portable radios take either quite a few AA's, or a few 9V's. Also you can get radios that need C and D batteries.
There are radios made just for the shower that are waterproof but even if the radio was not since there made in such small sizes you could simply put it in a ziplock bag and it could be used in a shower.
Almost all portable radios have a headphone jack. Even radios that are ten years old or more have a headphone jack so its pretty much standard.
Yes, there are.
You can purchase Grundig portable radios from retailers such as Amazon. Once on the page, type "Grundig Portable Radio" into the search field at the top of the page and press enter to bring up the items.