This is the bargain of the site: real, fully refurbished original 500 desk telephones, full modular. This means that handset and line cords plug right in (easy to replace cords). These sets are ready to plug and play: no wiring required. These sets look brand new. If you want to use on VOIP or just use to make tones on a system requiring tone tones, you can order the pulse to tone converter to put in line.