Axxess AX-ADBOX1 Auto-Detect Radio Replacement Interface for Installation of Aftermarket Receivers Auto-Detect Interface Control Box Retains fade adjustment when used in vehicles with Digital OEM Amplifier.Adjustable Gain Control for SYNC (Ford) Supplies 12 Volt 10 Amp Accessory Retains R.A.P. (Retained Accessory Power) Can be used in amplified or non-amplified systems