This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories,and may arrive in a generic box. Only select sellers who maintain a high-performance bar may offer Certified Refurbished products on Amazon.com. 【H.265+ 16CH FULL 1080P 4-IN-1 HD-TVI DVR with 2TB Security Grade Hard Drive】With the H.265 technology, which could double the data compression ratio, keep the high quality video even with low bit-rate, it allows you to maximize storage space and enjoy ultra-long recording. Support ultra-long continuous recording and backup by USB. Dvr 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. 【Compatible with 720P, 1080P Security Cameras System】This 16 Channel 4-in-1 DVR which supports analog, HD-TVI, CVI, AHD camera. It provides you the flexibility to add 16pcs 720P, 1080P CCTV Security Cameras 【View from anywhere anytime】 The ZOSI Smart free app lets you see all of your cameras in one place. Check in on your home or business wherever you have an internet connection. Free ZOSI Smart App for Live View & Playback on Smart Devices with Wi-Fi or 2G, 3G, 4G Anywhere Anytime. This pre-owned or refurbished product has been professionally inspected and tested to work and look like new. How a product becomes part of Amazon Renewed, your destination for pre-owned, refurbished products: A customer buys a new product and returns it or trades it in for a newer or different model. That product is inspected and tested to work and look like new by Amazon-qualified suppliers. Then, the product is sold as an Amazon Renewed product on Amazon. If not satisfied with the purchase, renewed products are eligible for replacement or refund under the Amazon Renewed Guarantee.