The device looks reliable. So far, there have been no complaints. It coped with the main task, namely, it helped to start a car with a dead battery after being idle in the cold. Has pros: Looks solid and reliable. 2 liter turbo diesel immediately started. The instruction is in 2022, everything is clearly painted. Cons: Short wires with alligator clips for terminals. It would not hurt to add at least 2-3 cm. I barely caught on the battery directly.