Mitel 50002823 5448 IP PKM with Interface Module (Dark Grey/Refurbished)The Mitel 5448 Programmable Key Module provides 48 additional feature keys for a Mitel 5220 IP Phone. The Mitel 5448 can be programmed as feature keys, speedcall keys, Direct Station Select keys, or line appearance keys. Each key has a Line Status Indicator that works the same way as those on the associated telephone. The keys can be programmed through the telephone set. Key Features: Mfr. Part #: 50002823 Telephone in photo is sold separately