Yealink SIP- T46U Productivity-enhancing SIP Phone for Office Workers and Professionals Sound and Hear with Remarkable Clarity Yealink Optima HD Voice technology combines cutting-edge hardware and software with wideband technology for maximum acoustic performance. Efficient Deployment and Management Yealink T4U series supports effortless mass deployment and Zero Touch Provisioning with Yealink's Redirection and Provisioning Service (RPS) and Boot mechanism, making the device management labor-saving and efficient for the administrators. Dual USB Ports for Flexible Expansion Choices Color-screen Expansion Module EXP43 The 4.3-inch color screen expansion module is designed to offer advanced call handling capabilities with its simplified UI and up to 60 programmable keys for various features. Yealink T46U SIP Phone | Features at a Glance User Interface Features• 4.3" color screen with backlightAudio Features• Optima HD voice with Acoustic Shield and Smart Noise FilteringBasic Features• Up to 16 SIP accounts• PoE support • Stand with two adjustable angles, wall mountableAdvanced Features• Wi-Fi via WF40/WF50, Bluetooth via BT41• Support expansion modules• Support USB recordingConnectivity• Dual USB ports, dual-port Gigabit Ethernet• Headset, EHS support