Bose A1 PackLite Power Amplifier Module<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Compatible with Bose L1 Model II and Model I systems </span></li><li><span class="a-list-item"> Powers up to two additional B1 bass modules or one addition B2 bass module </span></li><li><span class="a-list-item"> One 1/4 </span></li><li><span class="a-list-item"> Nylon carry pouch </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41SGdcUayIL.jpg" noproxy>