Feature●POLYCOM VVX power supply has a voltage input range of 110V-240V and a frequency range of 50-60Hz. It has an output of 5V with a current of 3A. It comes with a 70 inch power cord and 5 different adapters DC plugs of sizes 5.5 * 2.1, 4.0 * 1.7, 4.8 * 1.7, 3.5 * 1.35, and 2.5 * 0.7MM.●5vdc power supply is compatible with Cisco voip ip phones - SPA 303, 500, 501G, 502G, 504G, 508G, 509G, 512G, 514G 525G2, CP500, 900, 922 and 942.●This 5v IP telephone adapter is suitable for use with Yealink SIP phones such as the T29G, T46S, T48S, T52S, T54S, T54W, T56A, T58-CAM, T57W, T58V, T58A, MP56, MP56-TEAMS, and MP56 Teams Edition.●ac power adapter for poly vvx 250 Compatible with Polycom VOIP IP Phones Poly VVX 150 250 350 450 Edge B, E400, E300 Series, E220, E100 EM50●The warranty includes a 30-day return policy, 12 months for exchanges, and access to customer service 24 hours a day.Description