[ Volume Adjustment]Passive Preamp Speaker Volume Controller, sound quality lossless output design, easy passive preamp, smooth and transparent tone, allowing you to easily enjoy yourself in wonderful music. [High Quality Material]Passive Volume Control is made of all metal material, with fine workmanship and all metal casing. The interface is anti interference, anti rust, sturdy and , and has a long service life. [Passive Design]Passive Volume Controller, no need for power supply, plug and play. Only 1 pair of interface input and output, simple and easy to use [Compact and Portable]Passive Preamplifier is compact and , and easy to carry, allowing you to enjoy high quality music, anywhere. [Stable Performance] Passive Preamp Speaker Volume Controller has stable signal and clear and pure output audio. It is suitable for use or in professional recording studios to meet your different listening needs. Color: Black Material: Metal Package Contents: 1x passive preamp speaker 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.