Jameco Reliapro DDU090100 Transformer, AC to DC Wall Adapter, Single output, 9 V, 1 Amp, 9 W, 2.6 x 2.4 x 2 Size. Polarity - center positive. Connector type- cylindrical female. Connector size- 2.5M x 5.5Mm. Jameco Reliapro DDU090100 Transformer, AC to DC Wall Adapter, Single output, 9 V, 1 Amp, 9 W, 2.6 x 2.4 x 2 Size. Unit Count : Wall Adapter.