This DVR is compatible with 2MP/5MP HD TVI, AHD, CVI, RS485 PTZ cameras and analog security cameras. For optimal performance, use this TIGERSECU DVR with TIGERSECU 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 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. 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. High efficiency video compression enables you to record more footage for the same storage space. No fan noise and a quieter system with our unique heat sink fan technology that enables the DVR to self-cool and prevent overheating. 4 audio inputs for audio recording on 4 channels (channels 1 to 4) in addition to 16 channels of video recording. 3 monitor connections through HD-port, VGA and CVBS ports. 1920 x 1080 pixels DVR display resolution. Works with TV and computer monitors with a minimum 1080p resolution. This DVR is compatible with 2MP/5MP HD TVI, AHD, CVI, RS485 PTZ cameras and analog security cameras. For optimal performance, use this TIGERSECU DVR with TIGERSECU 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 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. 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. High efficiency video compression enables you to record more footage for the same storage space. No fan noise and a quieter system with our unique heat sink fan technology that enables the DVR to self-cool and prevent overheating. 4 audio inputs for audio recording on 4 channels (channels 1 to 4) in addition to 16 channels of video recording. 3 monitor connections through HD-port, VGA and CVBS ports. 1920 x 1080 pixels DVR display resolution. Works with TV and computer monitors with a minimum 1080p resolution.