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Key Features: Industrial level design; Advanced audio/video compression technology; 4-channel video input,1ch audio input; Local PTZ control; Data redundant storage technology; Patent UPS power-off protection design; Fast startup; Optional function: Bi-directional voice communication, telephone dialing, disk pre-heating; Central management software provided for optional; Support intercom function; Support I/O alarm, over speed alarm, g-sensor alarm, video lose alarm, motion detection alarm; Support broadcast voice; Support 2TB HDD&max 256G SD card. Taxi mdvr 2.jpg Truck mdvr.jpg 921343160496102150.jpg