Comes with TI-1a Transformer Interface so you can use it with regular headphone amplifiers as well as the necessary cables. Comes with three sets of pads - the original pad which have the three section cutouts, the "coffee bean" pads with the two cutouts, and the donut pads with no cutouts. Also includes an 4 pin to XLR interface cable to integrate a traditional amplifier with the TI-1a interface. Plus the OB Compensation adapters to use the interface with the SR1a/b headphones. PayPal fees and shipping included at my price. See pictures for details.