Metra Electronics AXADBX-2 Features:

The AX-ADBOX1 main interface control box is designed for retaining features lost when replacing the OEM radio. This is for the control box only and must be used along with the appropriate vehicle wiring harness (sold separately).Retains Balance and Fade (If you have a digital amp and you prefer to retain fade control, use the AX-ADBOX1 – excluding Ford and VW vehicles).

Provides Accessory Power - 12-Volt 10-Amp
• Retains R.A.P. - Retained Accessory Power
• Used In Amplified/Nonamplified/ And Digital Amp Systems
• Retains Chimes - In GM
• Turn Signal Click - In GM
• Provides NAV Outputs - Parking Brake/Reverse And Speed Sense
• Retains OnStar®/OE Bluetooth®
• Adjustable Gain Control For Overall Volume On Amplified Systems