MRB H4HDD Series, User Manual, Page: 27 / 55

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3.ALM(alarm), the light will be on after any alarm is triggered (green).
4.VLS, this light is always on (green) when any path video is lost.
5.REC(video light), which is always on during video recording (green).
②： remove the hard disk box socket;
③：
SD card slot;
④：
SIM card slot;
⑤：
LAN infrared extension line socket;
：
infrared receiver head;
⑦： USB2.0 (backup and mouse operation);
⑧：
RJ45
，
network port.
5.2 Rear panel
(SSD Video back panel
）