Microphones.

Types.
New CBs always come with a standard type of microphone, but there are other microphones available.
Many different types of microphone have been made for CB and they range from replacement basic microphones to expensive base station microphones. Some types are made for certain use, such as base or mobile, but many are designed to improve your sound in some way.

Issues
Although non-standard microphones are supposed to improve your outgoing sound, care must be taken in choice of microphone and the settings used on that microphone.
It must be noted that, with FM CB, boosting your outgoing sound too much can easily start interfering with other channels and CBers. The spacing between CB channels allows little room for sound. The best improvements are usually made by careful shaping of the outgoing sound, rather than just boosting it.

Standard microphones.
These are often the same as the microphones used with some CBs and are intended to replace the original microphone if they break. There are different shapes available, but they mostly work basically the same and offer no improvement over the original.
There are three main types of standard microphone, depending on the actual element type used inside.
  1. DYNAMIC: By far, the most common. These are like a miniature speaker and so use magnets.
  2: ELECTRET. Less commonly used as standard on CBs, but some Midland type radios have been known to use them. There is a small compatibility issue with these microphones... an electret microphone will only work on a radio designed to run one and will not work on some microphone testers, but a radio which uses one of these can also work with a dynamic type microphone.
  3: Crystal. Not used as standard on UK CBs, but some crystal replacement microphones have been seen. As UK CBs are designed to run with a dynamic microphone, these may not sound as good on UK CBs.