Features: Bidirectional Volume Adjustment: This car audio remote volume controller features two ways of volume adjustment - either to increase the volume for a more powerful sound or to decrease it for different driving environments or personal preferences. This bidirectional adjustment function provides drivers with more autonomy and control when enjoying music. Premium Material Construction: Made with a copper core and plastic casing, the controller ensures stable audio signal transmission with minimal signal loss due to the copper core's excellent conductivity. The plastic casing provides durability and a comfortable grip, making the controller robust and reliable. Easy Installation: Designed for simplicity, the controller can be easily installed in the car without the need for additional wiring. This saves installation time and reduces complexity, allowing drivers to enjoy music sooner. Instant Adjustment: Once installed, drivers can directly adjust the volume through the controller without interrupting their drive or searching for other adjustment methods. This instant adjustment feature enhances the driving experience by providing convenient volume control. Specifically Designed for Cars: This controller is tailored for car amplifiers, enabling remote control of the volume, particularly suitable for adjusting the volume of subwoofers and other audio equipment. It allows drivers to precisely control the volume while enjoying low-frequency effects, ensuring a safe and enjoyable driving experience without overly loud volumes. Specifications: Color: Black Material: PVC + Copper Cable Type: Six-Core Cable Length: 4m / 157.48in / 13.12ft Package Included: 1 x Volume Controller