Mini Low Noise Volume Controller Volume Adjustment Device Passive Preamp Active Speaker Volume Adjustment Controller without External Power Supply and Lossless Output Interface Features: This volume control allows you to adjust the volume of your speakers effortlessly. Its interface ensures lossless output, allowing you to enjoy your favorite music without any signal degradation. With its passive design, it eliminates the need for an external power supply, making it incredibly convenient. The volume adjustment adopts a professional 128mm pusher volume switch, which has a small accuracy error and better synchronization of the left and right channels, with no loss of sound details. The appearance is made of all metal materials, with a precision steel casing. The compact size is suitable for any system and is compatible with all types of playback devices and external active speakers. Specifications: Material: Metal Input Channel: Supports 1 set of stereo lotus head interface inputs Output Channel: Supports 1 set of stereo lotus head interface output Volume Adjustment: Using a professional 128mm push switch Signal to Noise Ratio S/N: >98dB Output Gain: 0dB Output Loss: <0.01dB Distortion: <0.002% Frequency Response: 10Hz-50kHz Input and Output Impedance: 10-50kΩ Input/Output Interface: The input/output adopts a gold-plated lotus head interface Power supply: No external power supply required, directly plugged in for use Item Size: 165 * 70 * 50mm / 6.50 * 2.76 * 1.97in Item Weight: 430g / 15.16oz Package Weight: 522g / 18.42oz Package Size: 22.5 * 10.5 * 6cm / 8.85 * 4.13 * 2.36in Package List: 1 * Volume Controller