NOTE: 12V power needs to be connected to ACC, if connected to the vehicle battery will always working. Easy to install. Add an amp amplifier adapter for Toyota nearly can be use for any stock stereo with this line out converter. Simply tap into the car audio speaker wires with snap adapters. Note: NOT compatible with factory amplified stereo systems like JBL, Bose, etc. Only works with factory non-amplified systems (no JBL/Synthesis, Bose, etc.). No factory external amp systems. The amplifier adapter for Scion factory radio compatible with: 2012-2015 iQ, 2005-2016 tC, 2013-2016 FRS, 2016 iM 2016, 2004-2006 xA , 2004-2015 xB, 2008-2014 xD. Radio add an amplifier for Subaru: 2016-2018 Crosstrek, 2013-2018 BRZ, 2012-2018 Outback, 2016-2017 WRX, Forester with SD card or OE NAV 2009-2013, 2014-2015 Forester with NAV, 2016-2018 Forester, 2012-2014 Impreza with NAV, 2015-2019 Impreza, 2013-2014 Impreza WRX with NAV, 2012-2017 Legacy, 2013-2014 XV Crosstrek with NAV, 2015-2016 XV Crosstrek. Tundra add amp adapter converts car stereo speaker wire output to RCA Cable outputs. Fits for Toyota: 2000-2018 Tundra, 1987-2017 Camry, 1987-2018 Corolla, 1988-2017 4 Runner, 1996-2016 RAV 4, 1995-2016 Avalon, 2001-2016 Highlander, 1955-2016 Tacoma, 1998-2016 Sienna, 2001-2018 Prius, 2007-2018 Yaris, 2007-2014 FJ Cruiser, 2007-2018 Yaris, 2009-2015 Venza. ( Please see the image for other Toyota models). Line Out Converter for Toyota. Camry add an amp amplifier adapter allows to add 2 channel or mono amplifier or subwoofer to existing factory or aftermarket car stereo kit. The function of RCA output can convert high voltage signal output of the amplifier/speaker to low-voltage signal.