I received the device, it actually served me as to inflate the tire after a good time. What's tribute is that it does nothing to boost a battery with a BMW 525td, not even a click of the engine and yet the sales department had answered me that it would serve. As the need has presented more than a month after purchase, I guess I'll have to keep this device as a memorial in the garage since I already have a tire inflator 10 of China with the same capabilities.