Universal Car-Audio Amplifier Bass RCA Level Remote Volume Control Knob Features: 4 rca gold plated. Mount in or under the dash. Dash Mount Amplifier Level Control for Volume Adjustment. It can adjust amplifier gain while driving. Perfect for balancing the system to change music styles. Simple in and out connections, no additional wiring needed. It is made of high quality materials and metal for optimal signal transfer. Comes with Mounting Bracket. Quantity: 1 Pic 100% brand new and high quality Material: Plastic Interface: 2 * RCA output 2 * RCA input Distance between mounting holes: 4.4cm (approx) Mounting: Suitable for most car The package includes: 1 * Audio controller 2 * mounting screws