247 Security Cameras carries 128 Channel NVRs up to 4K resolution. You can use it to connect IP cameras on the network, or attach cameras from DVRs and NVRs to consolidate your security camera system to one recorder. With this NVR you can use up to 128 IP cameras at user-selectable resolutions up to 4K resolution. For guaranteed compatibility we recommend the use of IP cameras we offer at247 Security Cameras. Compatibility varies depending on the manufacturer and ONVIF version.