'DECT Conference Phone • Built-in Battery • Built-in Bluetooth 4.0 • Built-in 3-Microphone Array • Optima HD Voice, Full Duplex Technology • 20-Foot (6-Meter) and 360-Degree Microphone Pickup Range • Yealink Noise Proof Technology • 5-Way Conference Call • Connect to PC via Micro USB Port • Hybrid UC Meeting • 3.1” 248x120-Pixel Graphical LCD with Backlight • Support Call Recording via Micro SD Card • Sensitive Touch Keypad • Upgrade Over the Air • Charging Cradle, with PUS'