My department has 3 of these units. The system is unique in that it is all digital, where the video is recorded onto an Ultra Compact Flash card (comes standard with a 4GB. Our dept. opted for an 8GB card). The recording system is designed as a rearview mirror which replaces your car's mirror. There is no trunk mounting of a recorder. There is a standard Hitachi digital camera mounted forward on the windshield, and a hidden camera in the rearview mirror that faces inside the car for video of prisoner transports. In addition to the external 900mhz mic, there is a second mic to mount in the rear. Also, the video monitor is built into the mirror and not seen unless its activated. There are many standard features, such as interfaces for your radar (displays target speed, patrol speed and lock speed on the recording), lights/siren interface, turn signals and brakes interface, GPS coordinates, and much more. The system is easy to install since there a no long cables or wires to run from the trunk. The CF card is easly removed (keylock included). We use the 8gig CF card which gives about 30 hours of record time. Each officer can "sign into" the system with there own passwords for individual recordings, if the patrol car is shared. You read further by visiting www.digitalallyinc.com. I give this system a strong thumbs up.