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Yealink Optima HD voice Dual-port Gigabit Ethernet4.3" 480 x 272-pixel color display with backlightWi-Fi via WF40Bluetooth via BT40USB recordingUp to 16 SIP accountsPaper label free design PoE supportHeadset, EHS supportSupports expansion modulesStand with 2 adjustable anglesWall mountable..

6 VoIP accountsOne-touch speed dial, redialCall forward, call waitingCall transfer, call holdCall return, group listeningMute, auto answer, DND3-way conference callDirect IP call without SIP proxyRing tone selection/import/deleteHotline, emergency callSet date time manually or automaticallyDial Plan..

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"160 × 120 resolution in thermal channel, high sensitivity sensor.● Point, line and area for temperature measurement● Temperature range: 30 ° C to 45 ° C; temperature accuracy: ± 0.5 ° C● Reliable temperature exception alarm function● 3D DNR, image detail enhancement● Strobe l..

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