With Samsung’s SDS-P3042 4-Channel DVR Security System, you always know what’s going on, from anywhere in the world. Beyond conventional viewing on your computer or laptop monitor, Samsung introduces its free iPOLis app to bring surveillance video right to your iOS or Android tablet or smartphone. In addition, Samsung's central management software, Smart Viewer, allows you to oversee multiple systems, in various locations across the globe, from one screen or monitor. Instant email notifications can be sent when motion is detected or when cameras are redirected, vandalized or covered - and the activity is automatically recorded onto the DVR. Bringing your safety to the forefront, Samsung empowers you to respond instantly to unexpected events, view real-time activity and review stored recordings. The SDS-P3042 cameras capture video at 720 TVL of resolution for the highest level of image quality. In keeping with this high standard, the DVR records at 960H high definition, surpassing both the D1 (720) and CIF (360) formats common to inferior systems. The 500 GB surveillance class rated hard drive will capture all of your important video events so they’re there when you need them. Samsung sets its sights on exceeding your visual expectations. So buy this Security System and Save $239.05 Off on a Samsung SDS-P3042 4-Channel 500GB DVR Home Security System - Refurbished for $199.95 after instant rebate with free shipping at Rakuten.com