EarthQuaker Devices Arrows Preamp Booster Effects Pedal<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Measures 4.37″ X 2.37″ X 1.5″ with knob </span></li><li><span class="a-list-item"> Controls Level: Controls the volume. </span></li><li><span class="a-list-item"> Power 9v Battery or any standard 9 volt DC power supply with a negative center 2.1mm barrel. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51iqtSoOLIL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51Av6QnGqnL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41e6%2BJPSWlL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51Fu3fRSnyL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/11vL5GZ9HGS.png" noproxy>