Add a subwoofer bass amplifier to OEM factory radio system. Plugs to back of radio. Prevents cutting factory wires 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. Compatible vehicles: No external factory amplifier vehicles only: Made for Honda: 2016-2021 Civic, 2017-2022 CRV, 2018-2020 Fit, 2019-2020 HRV, 2019-2020 Insight (no touchscreen) 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. Connection is done at back of radio. Compatible vehicles: No external factory amplifier vehicles only: Made for Honda: 2016-2021 Civic, 2017-2022 CRV, 2018-2020 Fit, 2019-2020 HRV, 2019-2020 Insight (no touchscreen)