The device's battery lasts for 1,500 applications. Weighing only about 130 grams, the Dräger Alcotest 4000 fits comfortably in the hand. The shock-resistant casing protects against accidental damage. After blowing into the mouthpiece, the exhaled air is directed through the air channel system of the device, and only a small sample is taken for analysis. This ensures that there is no accumulation of alcohol in the device, keeping all measurements precise and reliable – the same procedure used by the police.