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- 2.8-inch 320x240 color display
- 6 SIP accounts
- 30 paperless programmable keys
- 2 Gigabit ports
- 1 USB
- RJ9 Headset
- Adjustable bracket
- HD Codec, HD speaker, HD handset
- Built-in POE and Bluetooth 4.0
- EHS
- Wall mountable (requires stand)
- Advanced Mobile Phone Line: Answer or make mobile phone calls on U3S/O3S
- UniWIFI dongle for WLAN uplink (optionally available)
- Supports EP+ (Smartphone APP)
- Up to 2000 entries phone book