Millenium HPA In Ear, Compact Headphone Amplifier, Ideal for in ear applications, Connections: stereo XLR/ jack input, mini jack headphone output, mono/ stereo/ mix mode, Volume and balance/ mix knob, Stand or clamp mount via a 3/8"" thread on the long side, Operation also possible with 9 V battery (not included - Article Nr. #132579#), Dimensions: 170 x 93 x 47 mm, Weight: 450 g, Includes fitting power supply