Real-time surveillance: 8 Channels simultaneous video viewing and recording. Multichannel playback function as well as searching and downloading. This 8 channel Digital Video recorder with 4TB Hard Drive installed and configured is compatible with all 1080P 960P 720P TVI AHD CVI and Traditional Analog Cameras up to 2.4mp. NOT compatible with SDI Cameras and over 2.4mp Security Cameras. Quick remote access: View and Record in Widescreen with Remote Viewing on iPhone iPad and Android devices. Setting up is so easy! Simply download the smartphone App and scan the QR code. USB Backup Feature: The Digital Video Recorder supports USB port Back up gives you the easiest option of backing up and transferring your video footage to a USB flash drive. Motion detection & Email alert: by customizing settings you can use this function to receive email alert when there is an unexpected motion detected.