Kmise Z5215 Black 3 Band Acoustic Guitar EQ Equalizer Set Preamp Pickup Piezo<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Volume， bass ，treble Tuner control knobs </span></li><li><span class="a-list-item"> Supplied with a 9V battery box(battery not include)， Low battery indicator. </span></li><li><span class="a-list-item"> Size: 56mm x 52mm (2.2" x 2.1") </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Ze88jyZuL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31NWWgkri6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ABTm%2ByYnL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41oocfB4GrL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Zi6MnLz-L.jpg" noproxy>