... backup way of USB ,network video.6. GPS module built-in,3G module ,recording vehicle trajectory ,moving data and ... 20°C ~ +60°CClockBuilt-In Clock, CalendarPackagingProduct Size212(L)*210(W)*68(H)mm(with Holder)Product Weight2.2KG(without ... HDD)PackageEach In a Box, 10set/CantonBox Size252 ... ) H.264 Dvr 4 Channel 3g Mobile Dvr with built-in clock