From 1st July 2012 it is a legal requirement in France for all vehicles travelling on French roads (regardless of country of origin) to carry at least one breathalyser in the vehicle, that conforms to approved French standards (NF). 2 x NF approved alcohol breathalysers. This is a high quality product made by Alcosense. Easy to use and accurate. This disposable breathalyser is designed to alert you at the lower French drink drive limit of 0.5.