Additional Details ------------------------------ Bullet point: Consumer Alert: Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device. Product description: The Yealink Optima HD IP Conference Phone CP960, comprising the power of the Android 5.1 operating system. With user-centric design philosophy, this Y-shape brand new release from Yealink combines simplicity of use with sophistication of features, being perfect for any team environment, especially for medium to large conference room. In regard of its crystal-clear audio quality, your conversation will sound natural and bright anywhere with well- designed CP960, and beyond that, you can connect an external speaker to it if necessary. Key Features: Optimal HD audio, full duplex technology, 20-foot and 360-degree microphone pickup range, Two additional CP Wireless Expansion Mic CPW90, Built-in 3-microphone array, Based on Android 5.1 operating system, 5-inch multi-touch screen with 720x1280 resolution, Power over Ethernet, 5-way conference call, Built-in Wi-Fi/Bluetooth, Connect to PC via USB Micro-B port, Support call recording,