This awesome Headphone / Preamp is the first and only custom Woo Audio WA2 internally re-designed to accommodate remote volume control. It came with a stunning full metal volume remote control. I also had it upgraded with Blackgate caps throughout and replaced stock power tubes with NOS TungSol 5998 and rectifier tubes with Siemens and driver tubes Amperex Bougleboys. I waited 3 months for this baby, but it was worth the wait. Still breaking in, but already sounds amazing.