Power adapter not included. The Poly VVX 250 business IP desk phone is a high quality, four-line, IP phone that delivers reliable performance and enterprise-grade sound quality. It is ideal for knowledge workers, cubicle workers who need the high-quality features that today's modern business environment demands. Industry's best audio: the VVX 250 offers both Polycom HD Voice and Polycom Acoustic Fence technologies. Together, they dramatically improve the most important component of the VVX experience—voice clarity. HD Voice delivers superior, high definition sound quality through industry leading, advanced voice processing capabilities. The Polycom's exclusive Polycom Acoustic Fence technology keeps business conversations free from extraneous noises, echoes and distractions. Intuitive user interface: the VVX 250 combines an attractive new ergonomic hardware design and an intuitive user interface that together reduce the time