End user must provide Cat5 cables to hook up the phones. These phones are all powered by a "power over ethernet" (POE) switch and have a pass through so you can still provide internet to a PC without having to run another data jack. Please understand this is a standard setup for these phones and the auxiliary AC adapter is NOT included because the power is assumed to come from a POE switch. Honestly I dont even know why they have an external power source option on them. These phones were used on a Star2Star VOIP system and will require someone with working knowledge of your VOIP system to program extension numbers to them.This again is all standard practice. A factory reset can be performed on the units menu if you are using a different system than Star2Star. Please understand that ALL VOIP systems require some level of expertise and you must have a professional to make these work. I apologize but I i will be out of town. The item "Lot of 5 Polycom VVX 400 VoIP SIP Gigabit HD Voice Phone PoE" is in sale since Friday, February 8, 2019. This item is in the category "Computers/Tablets & Networking\Enterprise Networking, Servers\VoIP Business Phones/IP PBX". The seller is "lakelandrxrus" and is located in Reeds Spring, Missouri. This item can be shipped to United States.