As a DIY mechanic, I work on my four older cars on the road, although not extensively. The scanner performed well for 17 months. Actually, I didn't even have to charge it. Sweet, right? The device has stopped functioning because it has been offline for over 30 days. I need assistance from someone in Beijing, China to help me restart it. It has been extremely difficult to receive assistance. I would avoid this product. The price is favorable. The product works well, but if it stops functioning, you will likely lose your investment.