Using the Ebtech LLS - 2 Line Level Shifter is easy. First, identify the two audio devices with mismatched connections. Then, simply place one channel of the shifter on the cable between them. When routing, keep in mind that it can increase or decrease the signal voltage between -10dBu and +4dBV, so choose the right direction according to your needs. This shifter is not for use on mic level, instrument, or powered speaker lines. It's a passive device, so no power is required. To maintain it, keep it in a dry place and avoid physical damage. Clean the 1/4” smart jacks gently if they get dirty. With proper use and care, this shifter will keep improving your audio quality for a long time.