I'm selling both the headphones and the amplifier. The headphones are in good condition for their age, but no case is included. The amplifier has some hum, but there is no hum when the volume pot is put on the highest setting so it is probably a grounding issue. There is also a couple scratches in front of the amplifier and knob. I am hoping to get for the O2 mk1 headphones and for the SRM-323s amplifier. Shipping and Paypal fees are not included in the prices and are added. 3% for Paypal and $50 for shipping each. Thank you for the interest.