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About the Power Supply for Polycom VVX 300, VVX 310, VVX 400, VVX 410 Desk Phone
19W (48V, 0.4A) AC Power Supply for VVX 300, 310, 400, 410. Single pack
Unboxing the Polycom 48v Power Adapter
The 48v adapter powers Polycom phones when a PoE connection is not available.