This product seems to be fairly accurate - the only thing is that in the instructions, it says you aren't supposed to eat or drink anything 20 minutes before you use it, so keep that in mind. It's pretty small and comes with a little sleeve so you can keep it in your purse or glove box without it taking up much space. It's worth the money to have an idea of where you fall so you can be on the safe side.
great product!!! smaller then most cell phones and simple one button operation. if your going to drink, this product will allow you to do so in a responsible way.

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