Poly 2200-49760-122 is a power supply for CCX 500/600 phones, providing a dedicated mains power option for these models. The listing identifies this exact part number and its intended phone range.
Its stated output is 48 V and 0.52 A. The adapter is listed with a Continental Europe power plug, so the plug format is suited to that regional connection standard. The listing describes the package as a 1-pack.
The associated OEM reference is 86P04AA#ABB.