The ones with the heat sinks, they are linear amplifiers - power boosters, and aren't legal to use. You'd need a separate power supply for them too (a standard CB PSU normally runs around 3 amps, not enough for the booster) unless you used it in the car. Which you wouldn't of course as they are illegal to use
The mic meter helps prevent you distorting your speech. Which model is it? If it's Sadelta I'm going to get jealous...