Which are used as the storage medium. A DVR centric software platform (CMS) can be realized with links to a Central Alarm monitoring system for remote management and playback analysis. The DVR may look simple in its exterior design, provides powerful auto black box features, installation flexibility and high reliability. The item "Mobile DVR 4ch GPS+500gb sim WCDMA 3G Security Digital Video Recorder ShockProof" is in sale since Friday, December 14, 2012.This item is in the category "Business & Industrial\Facility Maintenance & Safety\Public Safety Staff Equipment\Other Public Safety Equipment". The seller is "ragecams" and is located in Sparta, Michigan. This item can be shipped worldwide.