An AV-Radio tuner is a simple device that lets you listen to music through passing a band frequency or radio frequency.  What a radio tuner usually does is select a specific signal however, the output can't be used automatically. The signal needs to be sent to a specific device.   A complicated explanation of something that you certainly use all of the time

The usual radio tuners that are seen out in the market contain the following features:

- loudspeakers
- audio amplifiers
- video display (used to form a TV set or radio display)

Radio tuners do come in two types, mono or stereo. Such are also available for tv, fm, am and other sorts of radio signals.

The simplest form of a radio tuner contains a capacitor and an inductor coupled with a demodulator. This has now become a radio receiver called crystal set.

The following are some of the products out on the market for radio tuners:

1. iLuv iMM173
2. Altec Lansing InMotion Moondance Glow iM402
3. Sony XDR-F1HD
4. iHome iP47BR (black)
5. Aluratek Internet Radio Alarm Clock with Built in WiFi
6. Sangean HDR-1
7. SDI iHome iHC5S
8. Cambridge SoundWorks Radio 735i
9. Tivoli Audio SongBook
10. Roku SoundBridge Radio

There are even some radio tuners that have built-in WIFI, some come in small packages, nice color, and designs. Radio tuners consist of features specifically designed to suit the taste of every type of person. Even those who are on a budget and would want to have a piece of music inside their car can purchase a radio tuner.