... phone surveillance5. Support backup with USB Flash Disk, Movable hard disk, USB writer, Network 6. Support 1channel. Main ... 8channel playback simultaneously(Optional playback channel)Recording BackupUSB,Moved Hard Disk,USB Writer,NetworkNetwork transmission8Channels real-time Network ... °C-50°CWorking Humidity10%-90%LCD Size15inch, 4:3, CCFL, XGA 8CH real time dvr with lcd monitor (GRT-DK7508MH)