DK2-21c Executive Elegant design, European style which will satisfy all demands of the business office. The DK2-21c phone would hold a place on the desk of any busy executive, or suit those who desire a top of the line telephone. TheDK2-21c series Digital Key phone equips with maximum 22 programmable(CO, Extension, Functions and Speed Dial) keys with dual-color LEDs and 17 functional keys. It also has optional Blue-tooth interface that a Bluetooth headset could be interfaced with. The DK2-21c Digital Key phone can used at all Gx Series telephone systems and Hybrid IP Communication systems on a DK port interface. As with all other DK series handsets the DK2-21c utilises single pair wiring making deployment over existing installed cabling simple and painless.