Smays 5.5 x 2.1 mm DC-in Plug 5V 2A 10W Power Supply Charger (Compatible Cisco SPA 500 and 900 Series IP Replacement Phone) Combined 5 ft feet power cord; 5.5mm x 2.1mm DC port barrel jack connector This adapter operates at 100 to 240 Vac input voltage, 50/60Hz 0.4A; Output: DC 5V 2A; Output power: 10 watt This one is a perfect replacement to replace a blown power supply that also rated at 5V 2000mA, with identical barrel connector UL listed; The unit meets 80ZN E215890, FC, tested to comply with FCC Standards, and is designed for ITE application; UL certified AC adapter ensures consistent power and reliable performance Replacement of Cisco PA100 power supply for small business VoIP