CP935W-Base ; Wireless SIP conference phone system; CP935W and W70B base unit bundle; Up to 20 simultaneous calls; Up to 10 DECT cordless handsets; Up to 10 SIP accounts; Opus audio codec support; No perception upgrade; 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 battery ; Up to 20 hours of talk time ; Up to 75 hours of standby in Wi-Fi mode, 167 hours of standby in DECT mode ; 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 ; 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 ;