User Interface Features
• 4.3" Adjustable Color Display 
Audio Features
• Optima HD Headset HD Speaker Full Duplex with Acoustic Shield and Smart Noise Filtering
Basic Features
• Up to 27 SIP accounts (3 Pages of 9 Keys)
• PoE support 
Advanced Features
• Built-in Wi-Fi (2.4G and 5G)

• Built-in Bluetooth 4.2
• Support expansion modules Yealink EXP50
• Support USB recording
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/2A output