30-day money-back guarantee for any reason, 12-month warranty for quality-related issues. If there are any issues, simply contact us, our customer service team will make it right for you ASAP. We would like to send you a replacement for free or send the refund until you were satisfied. High quality wiring harnesses. Solid connector, well-formed ABS plastic. Impact resistance, heat resistance, aging resistance and high hardness. Compatible with BMW: 3 Series (w/out OEM Nav) 2002-2006, 5 Series 2002-2003, X5 (w/out OEM Nav) 2000-2006, Z4 2003-2011. Mercedes-Benz Sprinter 2007-2010, Sprinter (w/out Radio Delete) 2011-2015. Compatible with Audi: A3 2006-2010, A4 (w/Symphony Radio) 2002-2008, A4 2009-2011, A6 2000-2011, A8 2000, Quattro 2001-2011, S4 2000-2008, S6 2000-2007, S8 2000-2010. Compatible with Volkswagen: Beetle 2012-2015, Cabrio 2002, CC 2009-2015, EOS 2007-2015, Golf 2002-2014, GLI 2002-2015, GTI 2003-2014, Jetta 1999-2015, Passat 2000-2015, Rabbit 2006-2009, Touareg 2004-2015.