Extends the distance handset can be used, no difference in sound quality from shorter cord, doesn't seem to tangle too much (at least so far), simple installation
Features: Mid-level phone, ideal for professionals and managers with moderate call load
4.3" 480x272-pixel color display, fully adjustable
HD Voice with Yealink Acoustic Shield technology
10 line keys, 16 SIP accounts, 27 memory keys
Built-in Bluetooth, Wi-Fi
Dual-port Gigabit Ethernet
1xUSB port for call recording and wireless USB headset
Power supply not included
Camera: Resolution: 4K, 1440p, 1080p, 900p, 720p, and SD at 30fps
Pan: Motorized ±25°
Tilt: Motorized ±15°
Zoom: 4X HD digital zoom
Diagonal Field of View: 120°
Horizontal Field of View: 113°
Vertical Field of View: 80.7°
Total Room Coverage (field of view + pan and tilt): 163° horizontal x 110° vertical
Protocols: LLDP-MED for VLAN discovery; IPv4; TCP (RFC 793) in SSL/TLS; Domain Name System (DNS): A records (RFC 1706), SRV records (RFC 2782), RTP (RFC 1889, 1890), RFC 5966
Security: HTTPS secure provisioning; Local Access Interface: IVR password
Camera: Number of cameras: 3
Number of preset positions: 9
Electronic gimbal
Lens FOV
Maximum pixels: 3x 50MP pixel
Depth of field: 0.7-8 meters
8 x digital zoom
Maximum resolution: 3840*2160
Video output resolution: 4k (2160p) 30fps, 1080p60fps
Effective focal length: 8.29 mm (Tele camera), 3.5mm (Wide camera)
Aperture: F/2.0-F/2.4
Supports wide dynamic range
Supports auto exposure
White balance: ATW/auto/manual
Shutter speed: 10ms-33ms
Minimum illumination: 0.5...