The Yealink SIP-T21P E2 Dual-line Phone Lot of 3 is a set of IP phones designed for business communication. Featuring wireless capabilities, wideband audio, speakerphone functionality, and Power Over Ethernet (PoE), these black phones offer a sleek and efficient communication solution. With dual phone lines and a variety of interfaces including DSL/Phone and Ethernet, these Yealink phones provide reliable connectivity for modern business needs. Manufactured in 2015, these phones are a reliable choice for companies looking to upgrade their VoIP business phone system. can be plugged into computer with ethernet cord three ethernet cords included.