Aguilar OBP-2TK Onboard Preamp<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Low-noise， discrete FET input stage </span></li><li><span class="a-list-item"> +/-18dB bass at 40Hz </span></li><li><span class="a-list-item"> +/- 16dB treble at 6.5kHz </span></li><li><span class="a-list-item"> Includes separate Treble and Bass pots. </span></li><li><span class="a-list-item"> Battery life: 324 hours </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/319ipZTtnAL.jpg" noproxy>