Hi rich. most of these systems are much the same as each other. but micro SD is limited like you say to hours the avers can use 2.5 or 3.5 1tb hard drives so if you have good power you can look at 7 to 12 days. can be alot longer if you use smart recording i.e say you are watching a front door from down the street you mask off the door on recorder and it will only record what is happening at the door and around the area once the mask has detected movment.
same as your the system can be set to either start from ignition and switch off either 10-20-30 upto 1 hour (or set to never stop) and these also have gps google overlay.
more info.
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Stable power supply for 4 cameras and able to operate under low voltage [/FONT]
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GPS function – showing vehicle location and speed in both live and recorded video (GPS receiver required) [/FONT]
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Dual-monitor function can be output as rear view monitor and general LCD or TV monitor simultaneously [/FONT]
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Support up to 4CH PTZ control [/FONT]
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Advanced Alarm Mechanisms [/FONT]
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Voltage Detection – Shut down the DVR or trigger alarm when encountering low voltage [/FONT]
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Pen drive for backup and UPC software supports HDD to HDD quick backup and instant events playback. [/FONT]
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Image protection mechanism: Time Stamp/ Shield [/FONT]
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Shockproof by rubber vibration insulator and brackets for double protection [/FONT]
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Support 2.5” or 3.5” hot swappable SATA HDD [/FONT]
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Power circuit protection for peak voltage [/FONT]
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Delay Power off – Keep monitor on after turning off the car, so users can continue monitoring via CM3000 and WebViewer [/FONT]
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Remote control up to 4 DVRs simultaneously regardless of different locations. [/FONT]
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Enabling to play own video to show information to passengers [/FONT]
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Support Daylight Saving [/FONT]
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Shock Detection – trigger alarm when hit by specified level of external force [/FONT]
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SMS alarm – Send GPS position and alarm message via GSM (GSM module) and 3G network (3G USB Dongle required) [/FONT]
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Wireless connection via WLAN environment (WiFi module) [/FONT]
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Remote Software Integration: CM3000/CM3000 Gold, WebViewer, PDAViewer, iPhoneViewer and JavaViewer[/FONT]