Power Supply - 9 Volt 1 Amps , 5.5 mm x 2.1mm Neg Center V 1000 mA
Neg ative Center Pin. 9 Volt / 1000 mA. 5.5 mm x 2.1/2.5mm Barrel Plug. Specific product expertise. (usually not more than an hour or two). Center negative pin as required by many products. with Center Shrapnel for Maximum Compatibility.