Display:
4.3-inch TFT color display with 480 x 272-pixel resolution and backlight
Intuitive user interface with icons and soft keys
Dual-color (red/green) illuminated LEDs for line status

Audio Features:
Yealink Optima HD Voice technology
Acoustic Shield technology for noise reduction
Full-duplex hands-free speakerphone with AEC
Wideband and narrowband codec support: Opus, G.722, G.711(A/µ), G.723.1, G.729AB, G.726, iLBC
Hearing Aid Compatible (HAC) handset

Lines and Features:
Supports up to 16 SIP accounts
Call hold, mute, DND, call forward, call waiting, call transfer
10-way conferencing
One-touch speed dial, hotline, redial, auto answer
XML Browser, action URL/URI
Busy Lamp Field (BLF), Bridged Line Appearance (BLA)
Anonymous call, anonymous call rejection
Hot-desking, voice mail, call park, call pickup
Centralized call recording, visual voice mail

Connectivity:
Dual-port Gigabit Ethernet
Power over Ethernet (PoE) support
Dual USB 2.0 ports for:
Bluetooth via BT40/BT41
Wi-Fi via WF40/WF50
USB headset
USB call recording
Expansion Module EXP43
Wireless Headset Adapter EHS40

Directory:
Local phonebook up to 1000 entries
Black list, XML/LDAP remote phonebook
Smart dialing, phonebook search/import/export
Call history: dialed, received, missed, forwarded

Physical Features:
Color: Classic Grey
Stand with two adjustable angles
Wall mountable

Power Supply:
Power over Ethernet (IEEE 802.3af), class 3
External Yealink AC adapter (optional): AC 100~240V input and DC 5V/2A output
USB output current: 5V 1A
Power consumption (PSU): 1.2-3.0W
Power consumption (PoE): 1.6-3.8W

Security:
TLS 1.3 for enhanced encryption
HTTPS certificate manager
AES encryption for configuration files
Digest authentication, OpenVPN, IEEE802.1X
IPv6 support