User Interface Features
• 3.7" Adjustable B/W Display 
Audio Features
• Optima HD Headset HD Speaker Full Duplex with Acoustic Shield and Smart Noise Filtering
Basic Features
• 8 line keys with LED and can be programmed up to 21 various features (3-pages view)
• PoE support 
Advanced Features
• Support expansion modules EXP50 (up to 3)
• USB call recording through USB flash drive.
Connectivity
• Dual USB ports, dual-port Gigabit Ethernet
• Headset, EHS support

Can be used as a router phone

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External Yealink AC adapter are OPTIONAL and sold separately

AC 100~240V input and DC 5V/1.2A output