Description: 【Precise 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 durable, and has a long service life. 【Passive Design】Passive Volume Controller, no need for power supply, plug and play. Only 1 pair of RCA interface input and output, simple and easy to use 【Compact and Portable】Passive Preamplifier measures 16.7cmx6.8cmx4.9cm/6.57inchx2.68inchx1.93inch, is compact and lightweight, and easy to carry, allowing you to enjoy high quality music, anywhere. 【Stable Performance】 Passive Preamp Speaker Volume Controller has stable signal transmission and clear and pure output audio. It is suitable for use at home or in professional recording studios to meet your different listening needs. Specification: material: metal Size Chart: 16.7cmx6.8cmx4.9cm/6.57inchx2.68inchx1.93inch Package Includes: 1x passive preamp speaker volume controller Note: Please allow slightly errors due to manual measurement and different monitors.