Smart Business Phone Runs Android 9.0 7 inch 1024 x 600 capacitive adjustable touch screen Delivered with wireless bluetooth handset BTH58 720p30 HD video with CAM50, optional Optimal HD audio, Yealink Noise Proof Technology Yealink s SDK Software Development Kit DoorPhone Features Preview, Onebutton Open, Monitoring Builtin Bluetooth 4.2 and Dual Band 2.4G/5G WiFi 2 x USB 2.0 ports for USB headset, media and storage applications Opus Codec support Up to 16 VoIP accounts Up to 10party audio conferencing Dualport Gigabit Ethernet, supports PoE Wall mountable Supports up to 3 Expansion Module EXP50 Supports Yealink/Unify Square Device Management Platformwithout PSU