Other microphones.

Echo microphone.
This is an amplified microphone with a built in echo effect. There are usually controls to adjust the output level and the amount of repeat on the echo. One of these controls may be inside the back of the microphone.
Echo effects for CB are also available in a separate unit.

telephone type microphone.
Some microphones were made in the shape of a telephone hand set. These had the PTT (Push To Talk) button between the mouth piece and the ear piece.
Obviously, they were designed as a novelty, and were probably not very popular in the UK.

I am not sure if anyone still makes these, or if any are still about in the UK.

Speech processor.
A speech processor is a special type of amplified microphone. These microphones are designed to solve problems caused by the wide range of sound levels in human speech.
The problem is that, while the peaks of your voice may be loud, there are also quiet parts. To avoid distorting your sound, the system must be set so that your peak levels are not too much... which can leave the quiet parts too low.
The speech processor will try to keep your sound level fairly constant by amplifying everything, then clipping anything that will exceed the maximum.

This is great for AM and SSB use, where your power output is related to your voice level and lower sound means lower power, but FM CB that we have has a constant output level.
For FM CB, the output is constant regardless of how much sound you put in and the clipping action of a processor may do more harm than good.
If you have money to spare, a good base microphone may sound better than most speech processors will on FM CB.

Speech processors are also available as separate units and as add-on boards to be fitted into the CB.