The high performance Telematrix 310091 3100LBY is a part of 3100 Series  Analog Corded Phones with  1 Line, Lobby in color Black. 

Features:

• Optional professional quality speakerphone
• OneTouch voice mail retrieval button technology on most models
• 10, 5 or 0 programmable guest service keys
• Compatible with all major PABX systems
• 3-way conference calling (2-line models only)
• Convenient data port
• 3-step speaker and handset volume control
• High/Low ringer volume switch
• Full-length custom-tailored faceplates
• Industrial grade construction with matte finish
• Non-slip base
• 5-year warranty
• Case: 10
• Available in Ash or Black

Variant: 3100LBY Black

Dimension: 8.5” L x 3.5” H x 6.75” W inches

NEW IN THE BOX