add an amplifier adapter w/amp remote turn on wire for sub bass amp to factory oem car stereo radio for select 2014-2018 gm vehicles- compatible vehicles below-no factory amp/bose-no 7" radio asc audio 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. not compatible with factory amplified stereo systems. only works with factory non-amplified systems (no jbl/synthesis, bose, etc.). connection is done at back of radio. no 7 inch screen radios for some vehicles- measured diagonally. compatible vehicles: colorado 2015-2018 (no 7 inch factory radio vehicles), malibu 2016-2017 (no 7 inch factory radio vehicles), silverado 1500 2014-2018 (no 7 inch factory radio vehicles), silverado 2500/3500 2015-2019 (no 7 inch factory radio vehicles), suburban 2015-2017, tahoe 2015-2017, gmc: canyon 2015-2018 (no 7 inch factory radio vehicles), sierra 1500 2014-2018 (no 7 inch factory radio vehicles), sierra 2500/3500 2015-2019 (no 7 inch factory radio vehicles) , yukon / yukon xl 2015-2016