Features:The passive mixer module is sent in assembled.F Our channels, each with an independent volume adjustment button.No battery or other power source required, easy to use.Small and compact size, easy to carry.Superior sound quality with ultra-low noise.High quality components and strong structure.Specifications:Type: 4-in-1-out / 1-in-4-out (Optional)Material: PVC+copperInput Impedance: 10K ohms~47K ohmsOutput Impedance: 2.5K ohms~10K ohmsGain: -12dB MAXItem Size: 85 * 55 * 26mm / 3.35 * 2.17 * 1.02inItem Weight: 106g / 3.75ozPackage Weight: 169g / 5.98ozPackage Size: 1 4.8 * 9 * 7.5cm / 5.83 * 3.54 * 2.95inPacking List:1 * Mixer2 * Double Head Plug2 * 3.5 Cable1 * Manual (English)