CP935W ; Optima HD IP wireless conference phone ; Switch easily between Wi-Fi mode and DECT mode with a single click ; Wi-Fi mode: Register SIP accounts over Wi-Fi, wireless SIP conference phone ; Built-in battery, up to 75 hours of standby, 20 hours of talk time;Create a meeting directly;;DECT mode:;Rely on the DECT base;Built-in battery, up to 167 hours of standby, 20 hours of talk time;;Shared across Wi-Fi and DECT modes: flannel-wrapped, new user interface, Linux, 4-inch multi-touch screen with 480 x 800 resolution, one CPW25-BT-Single wireless BT expansion mic (optional) (pending), built-in 2.4 GHz/5 GHz Wi-Fi, 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-metre) 360-degree microphone pickup range ; 5-way conference call ; PC connection via USB Type-C port ; hybrid UC meeting ; charging cradle with power supply