MIDI 4x4 USB MIDI interface<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> 4-IN，4-OUT MIDI interface(64 MIDI channels) low latency High-speed USB connection to PC or Mac MIDI in and MIDI out activity indicators for each port USB powered (no external power supply requires) </span></li><li><span class="a-list-item"> No driver needed Compact size MIDI IN: MIDI input 1-4 jack MIDI OUT: MIDI output 1-4 jack USB B Type: connection between the MIDI 4x4 and the host computer </span></li><li><span class="a-list-item"> ATTACHMENT: USB cable </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41UJtv33MwL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41%2BJJ-PaQlL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41TC%2BETGBnL.jpg" noproxy>