Use this adapter to make your installation of an amplifier to the factory system faster with a cleaner install. Use this plug and play adapter so you don't have to cut or splice into the factory wiring. Provides RCA output and a power wire for the remote amplifier turn on connection. Adjustable gain output. Connects to back of radio. Not compatible with factory amplified stereo systems- no factory external amp. Only works with factory non-amplified systems (no JBL/Synthesis, Bose, etc.). Connection is done at back of radio. Compatible vehicles: No factory external amplifier- Made for Subaru: 2019-2022 Ascent;; 2013-2022 BRZ;; 2016-2023 Crosstrek;; 2016-2020 Forester;; 2009-2013 Forester (vehicles with Factory NAV only and with SD card NAV- won't work with DVD based NAV);; 2014-2015 Forester (vehicles with Factory NAV only);; 2012-2014 Subaru Impreza (vehicles with Factory NAV only);; 2015-2023 Impreza;; 2015-2019 Legacy;; 2015-2019 Outback;; 2016-2021 WRX;; 2013-2014 Subaru XV Crosstrek (vehicles with Factory NAV only);; 2015-2016 XV Crosstrek