ART USBMix - 3 Channel USB Mixer w/ Audacity Recording Software<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> USB powered， no external power supply needed when used with a computer </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/511xfCcgdDL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/61TsRxF3ShL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51TKHOdN5eL.jpg" noproxy>