LILIN LHS-DVR204-500GB 4 Channel Standalone Digital Video Recorder with Network Capability H.264 and 500 GB Hard Drive H.264 Advance Video Compression Technology. Full D1 H.264 D120fps/R120: 120pps. Mobile Remote Monitoring- iPhone, 3G, PDA, Mobile Windows 5, 6 Compatible. User Friendly Graphic User Interface. USB2.0 Flash Drive file backup (Flash-Disk not Included). Network Audio, Voice and Live Monitoring. Multiple Web Browsers support- IE, FireFox, Chrome, Safari etc..