Description: brand new and high quality Feature: Converts car stereo speaker outputs to RCA outputs. Allows the addition of 2 or 4 channel amplifiers to most stereos without RCA outputs. Allows the addition of amplifier and subwoofer to existing factory systems. Adjustable level matching from 0-2 volts. For car stereos up to 80 watts. Specifications: Item Type: Speaker level converter Material: plastic+electronic components Size: 86x46mm/3.3x1.8in Color: As shown Quantity: 1 PC Instructions: White Connect to left speaker positive Connected to the left speaker negative Gray Connect to right speaker Gray black Connect to the right speaker negative Pure black ground wire Red Connect to 12V power supply (can be connected in parallel with the 12V power cable of the subwoofer) Connect the blue control line REM (connect the REM terminal of the subwoofer) Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Speaker level converter 1 x Cable