101 AV Inc. provides various kinds of high-quality and delicate-look security products. US Tech Support Hours: 8 AM - 5:30 PM PST. Tech Support info is on the front panel of the NVR/DVR. This model UND-08TC with 4TB Hard Drive 8CH HD-TVI/CVI/AHD H.264 / 265 True-HD DVR (Digital Video Recorder) is designed especially for CCTV system. It adopts high-performance video processing chips and an embedded Linux system. Meanwhile it utilizes many most advanced technologies such as standard H.264 with low bit rate Dual stream SATA interface HDMI and VGA output mouse supported IE browser supported with full remote control mobile view (by phones) etc. which ensure its powerful functions and high stability. Due to these distinctive characteristics it is widely used in banks telecommunication transportation factories warehouse and irrigation and so on.