High-performance wireless system that doesn't compromise sound quality. ATW-1501 The jack has been changed to a HISTORY L-type. You won't have to worry about it coming loose, even with a Les Paul. I used it at a live performance the other day and was able to play without any delay. I'm not going to be playing live for a while, so I'm selling it. It's a discontinued product and hard to find, so it's probably valuable. It comes with an ESP holder, so you can attach it to your strap and play without buying one. - Brand: audio-technica - Output Mode: A Mode - Connection Terminals: 1/4 inch jack - Included Accessories: AC adapter, holder - Features: Wireless system - Configuration: Transmitter and receiver Thank you for looking.