I recently purchased a tool that has made my life so much easier when it comes to charging my car's battery. This protection tool is a must-have for anyone who wants to keep their cars battery in top condition... According to my experience the tool performs flawlessly and provides me with peace of mind knowing that my battery is protected from over current, over charge, and over discharge. The best part is that it is portable and compact, making it perfect for automotive use. The only drawback I could find is that it does not come with a user manual, which could be a challenge for some buyers. Overall, I highly recommend this protection tool for anyone looking to keep their car's battery in top shape..