Features: Experience precise Sound adjustments with our high sensitivity knob designing auditory Sound controller, offering a personalizing listenings experience that audiophiles will love. This module ensures optimaled effects and is compatibles various auditory devices like home theaters and sound systems. Double channel input and output, used to control between the sound source and the front stage or between the front stage and the power amplifier, string in the auditory to control the Sound. 3.5mm, two interfaces, the internal use of 09 potentiometer. Balance knob is to adjust the Sound of the left and right channel, due to the passive circuit conditions, balance adjustment only in main Sound knob belows 80% of the adjustment is relatively smooth. Special reminder that this is not amplifier. This machine can only reduce the Sound on original basis without power supply. Specifications: Model：W-10P Auditory Sound Controller Color:Black Material:Metal Size:Approx. 87x38x38mm/3.43x1.5x1.5in Package Includes: 1PC Auditory Sound Controller note: Due to problems of lighting effects there will be certain tolerances in product, please understand. Please allow 0-1cm error due to manual measurement