User Interface Features
• 3.7" screen with backlight
Audio Features
• Optima HD voice with Acoustic Shield and Smart Noise Filtering
Basic Features
• Up to 8 SIP accounts, Memory Key 21 (3 pages of 7 keys)
• PoE support 
• Stand with two adjustable angles, wall mountable
Advanced Features
• Wi-Fi via WF40/WF50, Bluetooth via BT41
• Support expansion modules, Yealink EXP43
• Support USB recording
Connectivity
• Dual USB ports, dual-port Gigabit Ethernet
• Headset, EHS support, Yealink EHS40

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External Yealink AC adapter are OPTIONAL and sold separately

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