Product Features: Retains R.A.P. (retained accessory power) Used in amplified or nonamplified systems Provides NAV outputs (parking brake, reverse, speed sense) Pre-wired ASWC-1 harness (ASWC-1 sold separately) Adjustable gain control for overall volume (on amplified systems) Retains blind spot detection system (if equipped) High level speaker input Retains balance and fade Micro-B USB updatable