ZOSI 8CH HD-TVI 1080N/720P 4-in-1 Security DVR H.264 Digital Video Recorder for 720P,1080P Surveillance Security Camera System (Smartphone& PC Easy Remote Access, 1TB HDD) 1. ZOSI 8channel 4-in-1 DVR which supports Analog, HD-TVI, CVI ,AHD Camera. it provides you the flexibility to extend additional cameras.You can add 8pcs 720P or 1080P cameras. 2. Pre-Installed 1TB Hard Drive (expandable up to 4TB) for 24 Days of Continuous Recording at Highest Resolution. Longer Recording Times Up to 30+ Days Available with Use of Motion Detection 3. Email Notification & Mobile Push Alerts when Motion Detection,Free ZOSI VIEW Apps for Live View and Playback on Smartphone Devices under Wi-Fi/ 2G/ 3G/ 4G Network 4. Support USB port Back up , gives you the easiest option of backing up and transferring your video footage to a USB flash drive 5. Two year quality Warranty, Life time Tech Support ! If your product stops working in the first year we will replace it System Resources: Pentaplex function: live, recording, playback, backup &amp; remote access. Recording Mode: Manual&gt;Alarm&gt;Video Detection&gt;Continuous. Search Mode: Time/Date ,Alarm, Motion Detection &amp; exact search. Video Outputs: HDMI / VGA / CVBS. Audio Inputs/Outputs: 4CH/1CH. PTZ Control: Support. Hard Disk: 1 SATA ports(Max 6TB). USB back up: Support.