Yealink CP935W IP Conference Phone4 inch multi touch screen with 480x800 resolutio Optimal HD audio, full duplex technology Yealink Noise Proof Technology Built in rechargeable lithium battery Up to 20 hours talk time (in ideal conditions) Up to 75 hours standby time in Wi Fi mode (in ideal conditions) 20 foot (6 meter) and 360 voice pickup Built in 6 microphone array for voice pickup 5 way conference call Hybrid UC meeting Built in Wi Fi (2. 4GHz 5GHz, 802. 11a b g n) Built in
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