KONNWEI KW850 UNIVERSAL VEHICLE ENGINE SYSTEM SCANNER does not work. Every time you go to scan anything, the scanner ask you to buy the results of the scan. And if you just accept the charges, the scanner has no information displayed. It just freezes up. It does this on every feature. The scanner is completely junk, a scam to get you to buy a junk demo model. It's just a giant paper weight. It does nothing. I would get no stars, but you can't.