Mitel Superset PKM12 Programmable Key Module Kit (Light Grey/Refurbished)The Mitel PKM12 plugs directly into the dedicated jack on the 4000 series telephones. The Superset PKM12 adds 12 more programmable buttons to the Superset 4000 series phones. Key Features: Mfr. Part #: 50000112 Mitel Superset PKM12 Programmable Key Module Kit The kit includes; SIM 1 module Power Supply is required (Not Included) Color: Light Grey Condition: Refurbished