This 20V DC power supply is primarily a replacement or backup power supply for the DK30A2DH or DK30ADD laptop docking station. It provides universal power for any N-type barrel electronic device that requires 20 V and 2 amps. Replacing a Defective or Lost AC Adapter The power supply is a perfect replacement for a lost or damaged 20V / 2A AC adapter that was used to power existing electronics, such as the docking station. Keep a spare power supply on hand when downtime is out of the question, while spare power adapters are on hand to ensure that you don’t stay waiting for a replacement to arrive or to have to replace devices just for the sake of