PPP 10-503 Black 5000mA Universal AC/DC Adapter, specially designed with 6 different adapter plugs. A 2.35 x 0.75mm adapter, a a 3.5 x 1.3mm adapter, 4.0 x 1.7mm adapter, 5.0 x 1.5mm adapter, 5.5 x 2.1mm adapter, and a 5.5 x 2.5mm adapter. This adapter converts 120V AC to: 3.0/4.5/6.0/7.5/9.0/12V DC. Just move the switch to the correct output voltage for equipment, and check the rating plate or the number of batteries used in the device. Choose the correct multi-jack plug for your appliance. Connect the multi jack plug to the power jack, and plug the adapter in a standard electric outlet. If it does not work immediately, disconnect the adapter and review the instructions. The RED LED light indicates that the adapter has an output voltage/current.