Key Features:
Polycom VVX411 features Improved processor and memory performance upgrades
3.5 LCD Digital Display
12 Programmable keys
Features UCS 5.4.1
Integrated USB port
Gigabit Ethernet supported (10/100/1000 Mbps)
WebKit-based Browser
Polycom Acoustic Clarity technology providing Duplex conversations
RJ9 headset jack & EHS Headset compatible
Shared call/bridged line appearance
BLF | CTI | TCP | RTP
Local three way conferencing
One touch speed dial
DND function
SIP protocol support
PoE Or External AC adaptor

If you do not have PoE, you will need to purchase a separate Power Supply Unit.