9v (9-Volt) Battery Eliminator Adapter Conversion Connector Only by ProTechTrader 5 5mm Female DC Barrel Connector to 9-Volt Battery Snap Connector to be used with a 9v AC/DC adapter AC/DC Adapter Is sold separately or available as a kit with the battery snap connector conversion.Designed to work with a tip positive (center / middle DC connector positive polarity only) - This is required for correct polarity to replace standard 9-volt batteries (aka Transistor Radio Battery.5mm Fema...