Ray Samuels Audio, Tomahawk. Outstanding with all IEMs (in-ear monitors) as well as headphones like Grados. Attaches to a music player such as iPod or any other portable player. Runs on two AAA batteries that have lasted me for 400+ hrs per pair with my Focal Sphears. Used disposables. 6.6 x 4.3 x 1.8 cm . Tiny! Two gains: 1 and 4. Punchy bass, seductive mids, sweet highs. Embracingly warm sound. Excellent condition. Has tiny smudging of silk-screened text on back panel, minor. No scratches whatsoever. Beautiful gold end-panels as shown in pics. Two thumbscrews on back panel are used to remove panel to replace batteries. Easy to do, no screwdrivers needed. Great for travel. Comes with ob, no cables or players. Reviews: http://www.raysamuelsaudio.com/products/tomahawk http://threadbox.net/2007/04/04/rsa-tomahawk-reflection-pics/ http://hardforum.com/showthread.php?p=1031559940 http://www.gad.net/Headphonia/AmpReview1.html Retails for $300USD (400 CAD before shipping and duties). Price firm $300CAD shipped in Canada only. EMT/cash, pickup welcome in Edmonton Thanks for reading.