Stylish and functional in design, the SPA942 VoIP telephone is ideal for a residence or business using a hosted IP telephony service, an IP PBX, or a large scale IP Centrex deployment. The SPA942 leverages industry leading VoIP technology from Linksys to deliver an upgradeable high quality IP Phone that is unparalleled in features, value, and support. Standard features on the SPA942 include two active lines, dual switched Ethernet ports, 802.3af PoE support, a high resolution graphical display, speakerphone, and a 2.5 mm head-set port. With a simple software update, the SPA942 is upgradeable to a four line phone. Each line can be independently configured to use a unique phone number (or extension), or can be configured to use a shared number that is assigned to multiple phones. Sold without power supply (PA100). It is used to provide power when in-line power over Ethernet is not available.