NEC 12-Button Digital Phone. Brand New Includes 5 Year Warranty. . The NEC Digital 12-Button Telephone is a digital telephone. It has 4 feature keys and navigation keys with programmable LED keys. This 12 button telephone has unique features that includes energy saving sleep mode, dual-color call indicator lamp, built-in wall mounting, and 2-step angle adjustment legs. The full duplex speakerphone gives clear sound for handsfree usage. . . NEC Digital 12-Button Telephone.