Description: Ordinary high to low converter will lose some audio signal. But with this built-in delay converter, it can get rid of noise from the speaker, but with no signal missing and less impact on expander and subwoofer. Easy to install. Converts High Level to Low Level. Converts car stereo speaker outputs to RCA outputs. Allows the addition of 2 or 4 channel amplifiers to most stereos without RCA output. Allows the addition of amplifier and subwoofer to existing factory system. Specification: Material: Plastic+ Electronic Components Control Size: Approx. 83*43*23mm Cable Length: Approx 155mm Adjustable level matching from 0 to 2 volts. For car stereo up to 80 watts. Package Includes: 1 Piece Car Stereo Speaker Level Converter 1 Piece Cable Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Please check the size measurement and the picture carefully before making payment. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you.