Base material: aluminum alloyKnob material: plastic / aluminum alloy (optional)Operation mode: 4 kindsLED indicator mode: 7 kindsColor: BlackConnention port: standard USB (gold-plated)Length of cable: 1.7m / 66.93inDimensions of base(W*D*H): 50*81*24mm / 1.97*3.19*0.94inDiameter of knob:32mm / 1.26in(Plastic) / 40mm / 1.57in(Metal)Height of knob: 25mm / 0.98in(Plastic) / 20mm / 0.79in(Metal)Package dimensions(W*D*H): 130*90*80mm / 5.12*3.54*3.15inNet weight: 125g / 0.28lb(Plastic) / 131g / 0.29lb(Metal)Package weight: 200g / 0.44lbPacking List1*USB Volume Controller1*User Manual