The Carl Martin PlexiTone, is as the name might indicate an unusual high gain three step rocket of an overdrive.

The PlexiTone offers two step overdrive, the crunch channel and the high gain channel, on top of that it gives you an up to 20dB clean boost channel.
The crunch channel goes from subtle overdrive to hard rock gain stage, the high gain channel goes from rock gain stages to absolutely meltdown, with loads of gain and low end, and all in a tone that brings the memory back to the early 80's high gain guitar hero's.

The PlexiTone has as most Carl Martin pedals a built in regulated (+-12V) power supply, to secure the necessary headroom that gives you the great tone.