This tool has saved me a lot of money. I've taken my car to the dealer for scheduled maintenance a couple of times and the last two times the TPMS lights came on after leaving the dealer. The first time I picked up my car they hit me over $110 and said my TPMS valve had failed. The tires were not changed, but changed at the service center. This also happened on our other machine, but both reset after a few days. When 2 tires were low after this last service, I checked tire pressure and 2 tires still had the light on. That's when I decided to purchase this EL-50448 conversion device and five minutes later the TPMS light went out and the problem was solved. I can't give this tool a 5 just for the lack of instructions. You can see the instructions are printed on the tool but they don't make any sense. The sentences are grammatically confused, the wrong words are used. There are no further instructions on how to install the battery or the correct process. This works on my 2016 Chevy and there are tutorial videos on YouTube to walk you through the process. Overall it was a good product that worked great.