4K means 4 times pixels of 1080p resolution. More sharper images and realistic color representation even when digitally zoom. The IP cameras support starlight color night vision in low light conditions and 100 ft. IR night vision in completely darkness. 8 Channel Expandable NVR， you can add four additional 2MP/3MP/4MP/5MP/8MP IP cameras.

Instant Alerts with motion-activated white LED warning light and siren alarm， the IP cameras can be triggered manually or automatically or you can turn it off if unnecessary. As soon as the camera detects motion， instant notifications and email alerts with screenshot will be pushed to your smartphone directly as well.

Simple plug and play POE setup. Different from DVR security system， a single network cabling provides power， video and audio to your cameras. You will no longer need to install the security cameras to a power outlet nearby， which is more stable and reliable than wireless security system.

ZOSI NVR offers 4 kinds recording modes to meet your needs: record footage 24/7 continuously， record during scheduled times， only record when detect motion， recycle record. You can customize each camera with different recording modes and download the recording files for the USB backup

View and control your security system locally by connecting the system to a monitor without internet， or via free ZOSI client software on tablet， pc， or via smartphone app (ZOSI smart ) on mobile devices remotely， you can also playback significant evidence or funny videos records by searching different days， hours or minutes

No monthly fee. Pre-installed 2TB security grade hard drive for reliable 24/7 recording， ultra-long continuous recording and backup by USB. NVR can be set to automatically overwrite the oldest internally stored footage or you can transfer those video files by USB to a memory stick or external hard drive