It Looks Great On The Device Surgical grade stainless steel housing and golden front cover, make up a reliable all-metal body. All-Pro Level Materials The specially-made 6.35mm plug is made of high-purity copper, which is almost non-magnetic, and the surface is thickly galvanized with 24K gold. The soldering wire in the plug also uses high-purity 0CC copper. Upgrade To Be Non-Lossy The desktop amplifier device generally comes with a 6.35mm output port, and stocks with a common 3.5mm adapter. But the quality of the included adapter may not be that satisfying, so its recommended to upgrade to a better adapter so as to avoid getting lossy sound quality from your device. Specification: Model: DJ65A Female port: 3.5mm Dimensions: 9.9x19.5x20.5mm (exc the plug)