This is an IP phone Cisco.
Model: SPA514G
If you see the add the phone is up for selling.
Full-featured 4-line business-class IP phone supporting Power over Ethernet (PoE)
• Connects directly to an Internet telephone service provider or to an IP PBX
• Dual Gigabit Ethernet switched ports, speakerphone, caller ID, call hold, conferencing, and more
• Easy installation and secure remote provisioning, as well as menu-based and web-based configuration
• Supports up to two Cisco SPA500S Expansion Modules adding up to 64 additional keys
• Supports both SIP and SPCP Protocol with Cisco Unified Communication 500 Series
Full specs here:
https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/spa514g-4-line-gige-ip-phone/c78-698951_data_sheet.html
