Motopex Nano Glass for Adjustable RCA Line Convertor Low to High Impedance Amplifier Adaptor, MP3, MP4, Car FM Modulator  (Pack of 1)

Easy to install. Converts High Level to Low Level. Speaker Line input to RCA output. Adjustable level matching from 0 to 2 volts. For car stereos up to 80 watts. Amplifier Modify Accessory:This adapter is suitable for car stereos without RCA output to connect with the after-market amplifier. Although some amp has Hi-Low Convert function, we strongly recommend to have such an external converter to avoid the interference of the conversion inside the amp. Especially useful for CD radio stereo without Line Out port. Easy to install: White wire connect to the Left channel positive. Black/White wire connect to the Left channel negative. Gray/White wire connect to the Right channel positive. Gray/Black wire connect to the Right channel negative. Black wire connect to Ground. Red wire connect to the 12V battery positive. Blue wire connect to Control line REM.