Before buying this jump starter, I had two other Chinese ones, including one from a well-known Chinese smartphone manufacturer. The first Chinese starter died in two weeks - sent back. The second one, from a well-known manufacturer, barely started my car, and after half a year of use it stopped showing signs of life at all. I have been using Jstar One for half a year now and, pah pah pah, there are no problems, everything works properly and as it should. I absolutely recommend!