Features： 1、It converters car stereo\u0027s high audio signal to low RCA signal. 2、This adapter is suitable for car stereos without RCA output to connect with the after-market amplifier. 3、With such an external converter, interference from the internal conversion of the amplifier can be avoided. 4、Easy to install, white wire connect to the left channel positive.Black/White wire connect to the left channel negative. Gray 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. 5、Matching levels are adjustable from 0-2 volts. 6、For use in car stereos up to 80 watts. Specification： Features: It converters car stereo's high audio signal to low signal. This adapter is suitable for car stereos without output to connect with the after-market amplifier. With such an external converter, interference from the internal conversion of the amplifier can be avoided. Easy to install, white wire connect to the left channel positive.Black/White wire connect to the left channel negative. Gray 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. Matching levels are adjustable from 0-2 volts. For use in car stereos up to 80 watts. Specification: Color: clear Material: pvc Voltage: 12V Package size: 9 * 5.5 * 3cm Package weight: 100g Packing List: 1 * Audio Converter Package List： 1 * Audio Converter