Modest Design, Easy-to-Use User Interface，Built-in Battery, Wi-Fi and DECT to Minimize Deployment Costs，HD Audio, Smooth Communication，Rich Features and High Expandability

• 4-inch multi-touch screen with 480x800 resolution • Optima HD voice, full duplex technology • Yealink Noise Proof Technology • Built-in Bluetooth 4.2 • Built-in Wi-Fi (2.4GHz/5GHz, 802.11a/b/g/n) • Wi-Fi and DECT mode switchable (Switch via one-touch) • Built-in battery • Up to 15-hour talking time (in ideal conditions) • Up to 167-hour standby time in DECT mode (in ideal conditions) • 4-hour charging time • 20-foot (6-meter) and 360-degree microphone pickup range • Built-in 6-microphone array for voice pickup • 5-way conference call • Support to connect with a Bluetooth expansion microphone CPW25 • Hybrid UC meeting