Features: This volume control allows you to adjust the volume of your speakers effortlessly. Its RCA 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: 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: Greater than 98dB Output Gain: 0dB Output Loss: Less than 0.01dB Distortion: Less than 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. Material: Metal colour: black Package Contents: 4 x Passive Volume Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.