The Carl Martin Hot Drive 'n' Boost MK3 is an overdrive pedal designed to emulate the sound of a tube amp, offering a two-in-one functionality with separate overdrive and boost circuits. It features a built-in power supply, providing maximum headroom and a low-noise connection, making it a versatile choice for achieving a crunchy blues tone and a hard rock sound. The boost function provides an extra gain of up to 20dB for solos.