Product Specifications: Product Name: Car High Low Converter. Maximum Input Power: 50W. Maximum Output Current: 1A. RCA Output Level: 0-2V. RCA Output Frequency Range: 20HZ-20KHZ. Body Size: 3.15 * 2 * 0.98 inches/80mm*52mm*25mm Cable Length: 5.71 inches Weight: 2.65 ounce Package Content: 1Pcs x 2-Channel Line Output Converter & 1Pcs x Cable. Tuning ways: 1.Adjust the input level of amplifier to the minimal one. 2.Adjust the input level of Mr. Ho 2 channel line output converter (H-2) to the minimal one. 3.Turn up the volume of host. If the speaker system has the maximum undistorted power, the system is the best tuning program. 4.If adjust the host's volume to the biggest, but the speaker system fails to achieve the maximum undistorted power, just turn up the level of H-2, until the speaker has the maximum undistorted power. 5.If adjust the H-2's level to the biggest, but the speaker system fails to achieve the maximum undistorted power, just adjust the level of amplifier, until the speaker system has the maximum undistorted power. Note: If you don't use the REM control, you don't need to connect the red, black and blue wires.