4 gold plated 's Mount in or under the dash Dash Mount Amplifier Level Control for Volume Adjustment Can Adjust the Amplifier Gain While Driving Perfect for Balancing the System to Change Music Styles Simple in and out connections, no additional wiring needed Made from high quality materials and metal for optimal signal transfer Comes with Mounting Bracket Package Contents: 2 x Audio Controller 4 x Mounting screws Only the above package content, other products are not included. Note: Light 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.