This phone is Power over Ethernet (PoE). If your switches don't have this feature, you need to buy a power adapter for another $10. The description says 3 lines but it is actually a 6 line phone. Here is the guide: http://www.yealink.com/Upload/T4X/20140102/Yealink%20SIP-T41P%20Datasheet.pdf I installed it last night and so far so good. I have set up 3 lines on it. Can't say if I would buy it again as I have no desire or need for 6 lines. I would probably go with something cheaper. This is a shortcoming of a company that advertises a product and not a product which is why I left it at 5 stars.
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