Electro-Harmonix Knockout Attack EQ<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Controls: Low， Dry， High.1/4" input and outputDC power input for battery replacement.LED indicates whether effect is engaged or bypassed. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/61IUpkTZTTL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/11v5I--PGIS.png" noproxy>