what DVR can you recommend?
these are the specification.

Stand-alone -
Multi-channel, hybrid system.

Capable of stand-alone operation and as part of a system controlled by a remote PC;

Minimum of four (4) composite channel video inputs (BNC);

Minimum of four (4) composite channel video outputs (BNC); Minimum of four
(4) channel analog audio inputs with analog audio output;


Real-time motion @ 30 Frames Per Second (FPS) (per channel) on live and on recorded playback;

Storage - must be able to perform a minimum of ten (10) days non-stop video and audio recording

Minimum of 1.5 TB hard disk capacity;

Resolution - minimum of 4 CIF on every single channel display at recording, viewing & playback,

NTSC format; Duplex/Triplex Operation
simultaneous audio/video recording and replay;

VCR type - mechanical jog and shuttle or equivalent control equipped for easy forward and backward review of footage at variable speeds;

Full audio and video player/recorder functionality thru network;

Equipped with internal or external RAID storage system; Ethernet interfaces - 10/100 Base TX, Automatic recognition, RJ -45;

With built-in USB interfaces - 1 or more USB input;

With embedded Operating System; Access control, single or multiple, password protection, multiple access levels. Watermarking or other such proprietary video security to avoid tampering of data; Recorded file format must be read by or convertible to MS Windows OS file formats; Upgradeable Software via LAN and Flash ROM.

Must be able to update and check DVRs in blocks and can provide clear information regarding system state; Power source of 100V/AC - 240V/AC, 50/60Hz Autovolt

I know that the SymDec 16+4 from GE Security has most of these features. Not sure if it has all of them.

www.inox.com.my

or google search One Touch systems if you are in the Philippines

thanks