MASS Power 5V 0.8A AC Power for Grandstream IP Phones Imput: 100-240V~, 50/60Hz, 0.15A Output: 5.0 0.8A DC Coaxial Plug: 2.1mm (ID) x 5.5mm (OD) Center: + PLUG / SOCKET TYPE: A (used in, among others, North and Central America and Japan)