Avaya 9611G IP Telephone - 1 Gigabit - RefurbishedGigabit Ethernet Port 2. 8" x 2. 1" Colour display 8 Buttons with dual LEDs Local or centralised electrical power; through a 802. 3af switch or local power supply Support forDECT and Bluetooth headsets Expansion Modules available The telephone supports high definition audio to ensure that all conversations made sound as natural as possible. There is the option to go handsfree with this telephone as it has a and an option to use a compatible headset.