This product, the Kool S3000I dual camera black box is exactly that. It is a reasonably well built piece of kit. I ordered it just after Xmas 2014, and received it early in the new year. I've had a couple of weeks with it and I am very pleased with it.
In the box you get:
* a 3.5" TFT screen with a camera built into the back
* a separate second camera with a 5metre 3.5mm TRRS lead permanently affixed, and built into suction pad
* a 1.5 metre reverse trigger cable (single wire)
* a suction pad mount for the TFT screen/main camera
* 3 metre 12V car plug to USB mini B connector
* 1 metre USB A to USB mini B cable
* an AV cable to play directly from unit to a TV
Ok so first of all the packaging is quite good. Strangely there is a FCC + CE accreditation mark on the packaging, but not on the product itself.
The cameras/cables are well made and have a good weight/feeling to them. You won't be in a hurry to drop them, but they don't feel like they'll break at first drop.
The main unit (with front camera) has a microSD slot, a socket for the second camera, AV output port and mini USB socket. Screen quality is acceptable, but not amazing - poor resolution and contrast being bigger problems than screen size IMHO. The picture in picture mode works well and my 32gb memory card gets 11+ hours recording time with both cameras recording. The buttons click well and generally I'm satisfied with the response of the unit to user input. There is a built-in battery - and it is important to note that this battery is ONLY meant for clock and file saving. The manual states that the built-in rechargeable battery is NOT meant for use as the main power source. Consequently you will need to run it with power from the car.
Interesting features include the ability to record audio. This is surprisingly good and you can hear some speech and indicators clicking and switched on/off quite clearly. There is also a built in speaker, so playing the recordings on the unit (yes you can play back on the unit) will play the videos with audio. There is also the option to timestamp the videos if desired.
The unit's screen can be programmed to stay on indefinitely, or switch off after 30secs, 60secs. It will pop on once you shift into reverse (if you've connected the trigger wire), and stay on for the programmed time. There is no reversing grid, and the wide angle is deceptive - things are closer than they appear. The second camera has acceptable quality, and number plates can be read for cars up to 10m away in cloudy weather. There are no LEDs so nighttime its quite dark unless in a lit area.
Plugging the unit into a computer (with supplied USB cable) will give you the options to record video, act as a PC camera or other mode. This sounds like it could work as a rather fancy webcam on a PC. Whilst my mac recognises it, I couldn't get it to actually work... may work on Windows?
I'm no pro, but I installed the system myself, and it took the best part of 3 hours. This was in the new year, so quite cold - loads of tea breaks. The reverse trigger cable is rather short. On my focus estate, it barely reached the reverse light cable. You might need to solder on a wire to extend it. The video feed cable to the front unit is a 3.5mm TRRS cable 5 metres long, and it just survived on my estate. It might be necessary to extend it with a product such as StarTech 1m 3.5mm 4 Pole TRRS Male to Female Headset Extension Cable
. I get power from the 3 metre 12V supplied, which I've clipped into a power port with switch I added specifically for this unit.
So far the unit has fared well. I've recorded about 3 hours of footage about 10 days and playback is straightforward on the unit and with VLC on my computer (quicktime complained about encoding).
Some people have commented about clock inaccuracy.... my unit seems fine so far (touch wood). There was a little problem with the suction of the rear camera mount - it kept slipping off the rear windshield, but cleaning the inside of the windshield with a moist microfibre cloth solved it. The camera has stayed mounted for the past week. The suction in the front mount seems very good. The mounts themselves are nicely rigid.
For me, it was a toss-up between this unit, the Kool S3000I and the BW® BWS3000L 3.5 Inch Display HD 720p Dual Cameras (Forward and Rearview) Car DVR Video Recorder with 120 Wide Degree
. I'm happy with this and very impressed with what you get for your money.