Long transmission distance over coax cable. Up to 4/8-ch synchronous playback at 1080p resolution. Playback at up to 256X speed. 1SATA HDD can support up to 6TB Hard Disk Drive. RJ45, 2 USB PORT, Mouse, 6TB HDD Supported (HDD is not included). Free Mobile View (Android and Windows Phone), Can Be Watched Online, High Quality Branded Product. Hard Disk & Installation is not included. 2 Year Warranty of DVR. (Adapter, Mouse, Physical Damage & Burning are not covering in Warranty). Note- Anyone model of DVR will be given as per stock inventory out of mention two model numbers of DVR. Resolution and working functions of both model number DVR are same.