Conclusion: if you are the owner of a gasoline car, then the device is really worth the money and will be very useful especially in cold weather. Diesel is a useless device. Its pros: This launcher actually works. A car with an "empty" battery allows you to start. There is only one significant BUT - these are all gasoline cars with a small capacity battery (up to 75Ah). A gasoline engine up to 2.5 liters starts quite cheerfully in frost. Cons: Absolutely useless for a diesel engine. From the device, there really is some improved effort during the rotation of the starter in the first second, but no more. None of the diesel engines could be started.