"Optima HD IP Wireless Conference Phone Easily switch between Wi-Fi mode and DECT mode via one-click Wi-Fi mode: • Register SIP accounts via Wi-Fi, wireless SIP conference phone • Built-in battery, up to 75-hour standby time, 20-hour talk time • Create meeting directly DECT mode: • Rely on DECT base • Built-in battery, up to 167-hour standby time, 20-hour talk time Features Wi-Fi and DECT mode both share: • Wrapped with flannel • New UI • Linux • 4-inch multi-touch screen with 480x800 resolution • One wireless BT expansion Mic CPW25-BT-Single(Optional)(pending) • Built-in Wi-Fi 2.4GHz/5GHz, 802.11a/b/g/n • Built-in Bluetooth 4.2 • Built-in 6-Microphone Array for sound pickup • Optima HD Voice, Full Duplex Technology • 20-Foot (6-Meter) and 360-Degree Microphone Pickup Range • 5-Way Conference Call • Connect to PC via USB type C Port • Hybrid UC Meeting • Charging Cradle with PSU"