Defender SN500-4CH-X Web Ready 4 Channel Surveillance H.264 Security DVR with Smart Phone Access Record over 2 years of video footage on the built-in 500GB hard drive 24/7 lifetime live customer support is available through phone, email, and live web chat both before and after you buy Built-in USB port allows the transfer of video to a USB flash drive or external hard drive Advanced motion activated recording allows you to record only when motion is detected View your video online with no service fees from any computer in the world.