T46U VoIP SIP telephone, 2 x Gigabit Ethernet, 10 x line keys, PoE required, AC optional, 4.3 inch colour backlit LCD, HD audio, RJ9 headset jack, EHS support for specific Jabra and specific Plantronics headsets (cable required, SKU #EHS40), 2 x USB, Wi-Fi support (requires adapter, SKU #WF40 or SKU #WF50), Bluetooth support, SKU #BT41, optional wall mount bracket, SKU #YKT46WMB, add up to 3 expansion modules (sidecar / attendant console, SKU #EXP43), supports YDMP / YMCS. Optional AC power supply, SKU #PS5V2000US.