Fangrui Product Details Experience Sound Controls With Our Volumes Controller For Audiophiles And Sound Professional Seeking Low Noise Operate Without The Need For External Power. Crafted From Quality Materials, This Durability Volumes Controller Ensures Low Noise Performances And In Your Music Setups. For Sound Engineers, Studio Technicians, And Music Enthusiasts Who Demand Precise Volumes Adjustments In Their Music Experiences. Suitable For Live Performances, Recording , And Studio Work, This Volumes Controller Seamlessly Integrates With Mixers, Microphones, And Other Professional Music Equipment. Enhances Your Music Projects With Ease; Our Volumes Controller Offer Intuitives Functionality And Wide Compatibility, Making It Essential Tool For Any Serious Music Production Environment. Input Ranges:10hz-100khz,plugs And Play Without External Power Supply; The Appearance May Be Slightly Different Due To Different Factory Batches, But It Not Affect The Use Colour:black Material:aluminum Alloy Package Contents: 1 X Passiv