4-channel Stand alone DVR with VGA,4-channel, H.264 compressed 2 channel alarm input, 1 channel alarm output Real-time 4-channel Stand alone DVR with VGA,4-channel, H.264 DVR Details:1. H.264 Compression2. Adjustable 5-level bitrate,Adjustable image definition 3. Adjustable frame from 0.1f/s to 25f/s 4. 2 channel alarm input, 1 channel alarm output 5. Multi recording modes:manual, timing, alarm, ...