DESC: This phone operates off of 2 pair wire and has up to 6 line appearances. This Series II telephone can be customized with headset adapters, speakerphones, BLF/DSS modules, data modules and wall mount kits, This telephone is compatible with 240232 and 240240 circuit boards. Nec/Neax systems compatible with this telephone are the Mark II, 2400 and 1400.