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DVR/HD SDI DVR features:
Free mobile application for iPhone/iPad is: AAWHD,  for Android is: dvrseesee

Free manufacturer DDNS for dynamic ip address;

Remote playback on mobile phone

Email Alert Notice with snapshot when motion detected

For 4ch DVR, more features as below:
>4ch full 960H  

>Audio:2 in/1 out

>Alarm:4 in/1 out 

Record: 4ch 960H realtime

Video: 4ch BNC input,1 BNC+1 VGA +1HDMI output;

Audio: 2ch in / 1 out;

Playback: 4ch 960H realtime play back;

HDD: support 1 SATA, up to 4 TB

Alarm: 4 in / 1 out

I/O Interface: RJ45, 2 USB, IR, RS485