The radio has been an indispensable part of human life ever since it was invented and FM transmitters are a portable device that can be attached to a portable media player, CD player or satellite radio system. There is a frequency adjustment knob provided with the FM transmitter which allows the user to tune in to a particular radio station. The main purpose of the FM transmitter is to play music through a car stereo or any radio, for that matter.
The disadvantage of FM transmitters is that they tend to have very short ranges, typically up to 9 meters. Outside this range, the signal is very weak and this translates into inferior sound quality from the speakers. Once a threshold distance has been exceeded, the transmitter stops receiving signals altogether.
The FM frequency range varies from 76 MHz to 108 MHz. Some range of frequency bands may be allocated to the government for broadcasting important information like election results or Presidential address. There are some disadvantages of using FM transmitters like sometimes the sound quality may be affected due to cluttering of radio signals. This is a more likely scenario in urban areas than anywhere else. Yet another disadvantage is the absence of a volume control mechanism in some of the devices.
FM transmitters normally make use of batteries but there are some that extract power from the device to which they are attached. For example, in a car stereo system, the USB FM transmitter draws power from the car battery.

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