It seems that there is no italian forum regarding the dashcam but fortunately I found out this one.

If G - sensor are only on while parked ( no need to have it on while driving but some cameras only have one option that go for both parked and while driving ) DRV-A700W/ DRV-A601W/ DRV-A501W include a Polarizer Filter. This reduces such things as dashboard reflection on the windscreen, which may appear in certain positions or due to weather conditions, and helps to lessen glare on sunny days, making it possible to record clear outside images.What brand/ model memory card do you use. memory cards can also be the reason of camera problems, so if you can test it in a card reader on the computer it will be a good idea, use free programs like H2testw and crystaldiskmark, but really any disk benchmark program will probably work. I noticed that the blue LED is constantly on. Never red...always blue. Since blue = charging, I suspect that the internal battery (actually a Bitwell Supercapacitor) is no longer holding a charge. I had this same problem with a cheap made-in-China camera that this unit replaced. It's not serviceable. This is the garbage we, as consumers, accept.

I've already cabled my vehicle using the kenwood hardwire kit CA-DR1030. I've connected the cable to the fuse box of the car With its 3.7 megapixel CMOS sensor, DRV-A700W/A501W captures Wide Quad HD video at 30fps, 1.8 times as many pixels as Full HD, making super-high resolution recording and replay possible. The DRV-A601W supports 4K Ultra HD recording (8.3M: 3840 x 2160), which is 4 times the resolution of Full HD (2.0M: 1920 x 1080). It clearly reproduces the part invisible in Full HD video such as license plates. * By connecting the optional rear camera (KCA-R200) it is possible to record front and rear directions simultaneously.I love the kit because all references from Rusia was that the system was reliable and stable and because the form factor it is super compact and you can not see the cameras from outside... but it seems that the quality is mediocre if you plug the rear camera and it is not reliable at all... I will have to switch to VIOFO A129 or better VIOFO A139 because the car next to me kit me the door and it was not recording (g-sensor fault) and I can not see through the cameras the doors windows. Modification, alteration, translation, merging, reverse compiling, or reverse engineering of this software is prohibited. With it's 3.7 megapixel CMOS sensor, the DRV-A501W captures Wide Quad HD video at 30fps, 1.8 times as many pixels as Full HD, making super-high resolution recording and replay possible.