aardvark 24bit usb audio interface... mac & pc 2ms latency w/ os x zero latency monitoring) bus powered (totally portable) 2 line in 2 line out 1 mic/instrument in headphone out (high volume) level meter record level indicator very solid unit (perfect condition - durable) works w/ os 9 works w/ os x asio (unit works with reason, peak, core audio, cubase, metasynth etc) (unit sounds pristine and i never experienced audio glitches or dropouts - very cool!) see it at: http://www.aardvarkaudio.com/aasd-v1/products/usb3-main.html or best offer... buyer pays shipping cost