Aguilar OBP-1 TK Bass Guitar Pre-Amplifier<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Operates at 9 or 18V </span></li><li><span class="a-list-item"> All FET design </span></li><li><span class="a-list-item"> High headroom， low noise </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Q5nK1qw2L.jpg" noproxy>