Carl Martin Hydra Boost- Clean, noise-free 15dB boost. Small in size and simple in design, it gives you up to 15dB of low-noise boost. Imagine your solo with an extra few dBs on top to get it out where you want it in the mix, or maybe give your signal a boost into your amp for more sustain and bite. With the Hydra you can do all of that, or even drive your pedals for outrageous distortion. Carl Martin Hydra Boost Pedal Features: Low noise design - 9V adapter - Rugged housing - Vintage style knob - Bright blue LEDliulThe Hydra is made to the highest standards and guaranteed to be great.