A low power FM transmitter is the key to a quality piece of audio transmitted over the airwaves. Low power FM or LPR or Light emission/photo emission radios transmit on a lower frequency than conventional transmitters. A lower frequency means less energy needed to send the signal, which translates to less power, which translates to less noise. Generally, a lower wattage (watts) means a louder radio. There are two basic types of low power FM transmitter: battery powered and solar powered. Battery powered units need to be charged once a month while solar powered units do not.

Low power FM transmitter designs usually range from fifty-five to one thousand watts. The lower the wattage, the smaller the potential audience. In other words, radio stations transmitting on a two hundred watts FM transmitter have a much more expansive target audience than those transmitting on a five hundred-watt FM transmitter. Radio broadcast is not just a profession for some, but a fun hobby or part-time job for others, and a useful tool for many small businesses and local communities who want to send sound to a limited audience. Low power FM transmitter designs also allow amateur radio operators to communicate without using large transmitters, as they can use low power transmitters with an FM modulator.

Most FM transmitter manufacturers recommend that low power transmitters are used indoors. Outdoor applications include outdoor radio stations, boat launches, personal computers and even security or safety systems for homes, offices and business. It is safe to operate a low power FM transmitter outdoors if the user is aware of the fundamental differences between a conventional transmitter and a wi-fi transmitter. One of the key differences is that a conventional FM transmitter operates by picking up a signal from an antenna and then transmitting it as radio waves through the air.

Wi-Fi devices transmit their radio signals in clear patterns, using a radio frequency. Frequencies are measured in megahertz (Mbps) and are used to describe the width of the transmission data stream. Bandwidth determines how fast the signal can be transmitted. Bandwidth determines the maximum rate that a Wi-Fi device can transmit data. Bandwidth is often a factor in choosing the appropriate low power fm transmitter circuit, which requires consideration of the signal needed for the intended application.

Many low power fm transmitter circuits are designed with a single frequency or a few chosen frequency bands. Using a single frequency allows a transmitter to transmit more information with fewer watts, especially where multiple users will be using the device at the same time. A multi-frequency circuit is advantageous in that it allows many different users to synchronize their radio transmissions. Synchronizing with other users is important for two primary reasons: first, the user who synchronizes with the most users is given priority for time; and second, if the system is properly synchronized, each person's radio wave will land on a center frequency, which eliminates dead spots, and makes the receiving device most efficient. Also, most multi-frequency systems have an oscillator added to the circuit, which ramps the frequency up and down in order to maintain an even signal level.