TIGERSECU's Super HD hybrid security DVR/NVR is a full featured hybrid digital video recording system. For optimal performance, pair this DVR with TIGERSECU security cameras. This security DVR works with 2MP HD-TVI, AHD, CVI, RS485 PTZ cameras and analog security cameras. | Remotely access and play surveillance footage and control the security DVR with no contract or monthly fees with TIGERSECU's HD Viewer. For optimal performance, 1 Mbps network upload speed is recommended for each 1080P camera. Bitrate settings can be adjusted in the DVR to accommodate slower network speeds. Mobile app requires iOS 9.3 or later and Android 9 or later. Compatible with iPhone and iPad. | Unique heat sink fan technology enables the DVR to self-cool and prevent overheating, which means no fan noise and a quieter system. | Pre-installed with a new 2TB surveillance hard disk drive for 5+ days of continuous local recording at the highest resolution. Option to replace internal hard drive with up to two hard disk drives of 16TB each. Motion detection options allow you to record only when motion is detected to save hard drive space. | 4 channels of audio recording in addition to 16 channels of video recording. 3 monitor connections through HD-port/VGA/CVBS ports.