The Dräger Alcotest A4000 is a reliable breathalyzer device for personal use. It very compact and very accurate thanks to its use of police testing technology. Easily and discreetly storable in the glove compartment or seat rest, it is ready to use in seconds. The long-life battery allows for over 1,000 tests on a single charge. This simple device means drivers can be sure they are within the permissible range before starting their cars.