VOX AMPHONEAC30 Active Guitar Headphones (International Version - No Warranty) Headphones with built-in am Plug technology that allows you to obtain AC30 tone immediately Headphones made by Audio-Technica, the trusted name in headphones The headphone amp uses a new reactor circuit that's based on the Valve Reactor technology featured in Vox amps, delivering incredibly dynamic AC30 tone Totally analog design that faithfully simulates the circuit response of the original amp Faithfully reproduces the classic Vox AC30 tone