Easy to Use: 2 line keys support 8 lines or contacts. Illuminated mute, headset, and speaker buttons. Power adapter included. Audio Quality: Hear every nuance of your call with Poly HD Voice. Cut out home or office background noise with Poly Acoustic Fence technology. Audio Conferencing: Instantly add other workplace colleagues to your call with 5-way local audio conferencing. Compatibility and Convenience: More productive calls with a hands-free speakerphone with proven acoustic echo cancellation and background noise suppression technology. More headset options with both RJ9 and 3.5 mm headset ports. Ideal For: Small businesses and emerging markets. Plug & play with zero touch provisioning. Desk stand and wall mount option included. Enjoy crystal clear communications by outfitting your busy office or call center with the Poly Edge B10 IP Desk Phone and enjoy clear full-duplex HD calls. Featuring illuminated keys and a 2.8" monochrome display, this VoIP desk phone allows you to manage up to eight lines using the line and context-sensitive soft keys.