The Polycom 24 Volt IP phone power supply provides AC power to the Polycom SoundPoint IP phones. If your power supply is lost or damaged this is the replacement part. The Polycom 24 Volt IP phone power adapter is used to provide power to Polycom IP phones when in-line power over Ethernet is not available. Provides AC Power to the Polycom 320, 321, 330, 331, 335, 430, 450, 550, 601, 650 Includes Free AC Power Cord Detailed Product Compatibility: ·Polycom 320 Power Supply ·Polycom 321 Power Supply ·Polycom 330 Power Supply ·Polycom 331 Power Supply ·Polycom 335 Power Supply ·Polycom 430 Power Supply ·Polycom 450 Power Supply ·Polycom 550 Power Supply ·Polycom 600 Power Supply ·Polycom 601 Power Supply ·Polycom 650 Power Supply ·Part Number: 1465-42340-001. This power supply WILL NOT WORK WITH VVX PHONES