Aposonic Compact 4-Channel AHD 720P / Analog 960H Hybrid Surveillance DVR, Mobile Access, Mac Ready (No HDD) AHD 720P/960H/D1/Half D1/CIF Full Real-Time Recording / Playback Quality. Recording 1280x720 / 960x480 / 720x480 / 720x240 / 360x240 Resolution at 30 FPS per channel. 1x HDD bay, support up to 4TB. 1x Audio-in / 1x Audio-out. Firmware upgradable. DVR Motion detection triggered events can be promptly notified by loud audible alert and / or Email notifications to PCs or smart phones. Dual streaming technology to encode recording stream and network stream separately. Support NAT function, QR code scanning by mobile devices. Live view and access control through Internet Explorer, Firefox, Opera, and Mac OSX/Safari. Streaming live video / playback on mobile smart phones or tablets via free app.