The Mitel 5448 Programmable Key Module is an expansion to the Mitel 5224, 5235 and 5324 phones. This unit will add 48 additional feature keys that can be programmed as speed call keys, direct station select keys, or line appearances keys.
***Please note: Mitel PKM Interface Module is required to be installed on the phone it connects to.
The interface module is not sold with this PKM.
Please see accessories tab for compatible modules