... , IE browse,15 languages 4.HDD,alarm H.264 main profile compression algorithm ideal for standalone DVR 4 channels Realtime full D1 recording or ... Support 2*USB 2.0 port for mouse,backup,DVD-RW,movable hard disk,upgrade etc ... Alarm triggering screen tips, ... alarm center functions, support WEB client, standalone client and SDK With the sound system for the protection circuit, unique triple watchdog ...