New US411ZS 4TH Generation Full D1 (720 X 480 at 30FPS) on each of the 4 Channel a Commercial / Industrial Grade DVR with Embedded Linux Operating System hardware H.264 Compression DVR with Real Time Remote Surveillance. This is the most stable, the best user friendly and the most advanced H.264 DVR on the market. The US411ZS provide 'always-on' recording capability, with variable resolution, image quality, image rate, and 4 channels of audio recording; all are adjustable per channel. This US411ZS has several recording modes, including schedule, motion, alarm and panic button recording, each with individually adjustable settings per channel. The US411ZS have strong networking for Remote Viewing and data archiving features for Backup, along with a handheld IR Remote Controller and an optional USB Thumb Drive. The US411ZS boasts a large storage capacity, supporting up to 2TB hard drive H.264 compression reduces HDD consumption, yet allows for excellent image reproduction, at any resolution. The powerful user friendly GUI ties it all together with a simple to use menu and strong admin features. Built-in zoom and playback filter for full control and clarity Recording. Through its built-in 4 Channels of audio so you can record and playback audio with video over the internet. Dual coder allow for dual stream for 100% independent Remote view and live operation. Backup options available through a USB 2.0 Port support with free Iwatch DVR app for I-phone and androids devices (Hard drive is required for this unit to record).