I purchased one for my oldest son and myself one and they are absolutely the best. Very satisfied in this investment. Even though it can not be used legally it gives a person the information that is vital after drinking at all. We are all different as I can read being at the legal limit but my son can drink the same exact thing as I have and he is seveopoints lower than me. And the feature of giving a time of when it will be safe to drive again is great1
I bought this in December hoping to give it as a Xmas present to a son-in-law. There was a mix-up in delivery so it didn't come until January. Overall, it is great. Simple to set up and use. Useful to show people where they are on the BAC.
We purchased the product to use as a documented way of proof that this person was not an alcoholic, drinking all the time. But when we read it couldn't be used for court purposes as proof, we sent it back. That was our only purpose was a proof trail. So didn't use the device.