SMAKN&Acirc; DC 48V 500Ma Switching Power Supply Adapter 100-240 Ac Input: 100-240 V AC 50/60 Hz Output:48V, 0.5A (500 mA) Plug Spec: ID: 2.1 mm; OD: 5.5 mm; Length: 7 mm; Polarity: Center+ Cable Length: 120 cm (about 4 ft)