Aposonic 4-Channel AHD 1080P DVR with 4 x 1080P HD IR Cameras Surveillance System w/ 1TB HDD, Mobile Access, Mac Ready 1080P/720P/960H/D1/Half D1/CIF Real-Time Recording / Playback Quality. Recording 1080P @ 60 FPS or 720P @ 120 FPS on AHD cameras and 960x480 / 720x480 / 720x240 resolution at 120 FPS on 960H analog cameras. Including 4 of AHD 2.1MP 1080P fixed-lens 3.6mm cameras. 1TB HDD pre-installed. Motion detection triggered events can be promptly notified by loud audible alert and / or by Email to your PC or mobile devices. Dual streaming technology to encode recording stream and network stream separately. Support NAT function, QR code scanning by mobile devices. Support live view and remote configuration via all web browsers on Mac and PC. Streaming live video / playback, 1 screen zoom-in on mobile smart phones or tablets via free app.