Tech 21 Boost Series BST-D Boost Distortion Guitar Distortion Effect Pedal<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> All analog circuitry </span></li><li><span class="a-list-item"> SAG control adds an expressive， tube-like response to every pick stroke. </span></li><li><span class="a-list-item"> Up to 21dB of clean boost; can be used independently from the effect. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/515QNetNx3L.jpg" noproxy>