[PRODUCT INFO] ~ A Digital Breathalyser (Alcohol Tester) Model AT-6000 is a device for estimating blood alcohol content (BAC) which determines how much alcohol is in your blood. The test measures the amount of alcohol in the air you breathe out (exhale).[USES] ~ Drivers are initially tested for alcohol impairment at the roadside with a screening device. If this produces a positive test, evidential breath testing is performed at the police station. Motorists can be stopped and required to take a breath test by police at the scene of a road traffic accident, if a police officer suspects a motorist may be driving under the influence of alcohol, or if a motorist commits a moving traffic offence.[HOW TO USE] ~ Turn on the tester and wait few seconds for it to warm up, then start testing and the result will be displayed on the LCD Screen effectively. You can change the units by pressing the key (%BAC and mg/l)[IMPORTANT] ~ If the BAC result exceeds certain values, this breathalyzer will emit different tones to inform you so that you can make a better judgment. This breathalyzer is battery operated. (Requires 3 AAA batteries - Not in Included in delivery, must be purchased separately)[Package Includes] ~1 x Digital Alcohol Breathalizer Tester ( Without Batteries) 5 x Mouthpieces, 1 x User Manual