Breathalyzers Breath Tester, Portable Alcohol Bac Professional Personal Alcohols EASY TO USE Just press the power button for 3-5 seconds to start the professional breathalyzer, wait 15 seconds to warm up, then blow 5-6 seconds with the tester, the result is ready after 3 seconds and it appears on the LCD screen for 15 seconds (3 AAA batteries required - not included). HIGH ACCURACY This alcohol tester has a high-precision semiconductor alcohol sensor. It can provide a quick result to judge whether or not you can drive (just 5 seconds). Bring comfort into everyone's life, increase the feeling of joy and happiness is our driving force. LOUD ALARM SOUNDS You will receive an alarm by emitting a signal tone if the result is higher than 0.050% BAC, 0.500 BAC or 0.250 mg / L (BrAC). PORTABLE DESIGN This breathalyzer is easy to hold and carry. The white cloth pouch offers a lot of convenience so that you can take it with you anywhere and anytime, and ensures a safe driving after drinking. This breathalyzer adopted the blue backlight LCD display, you can read the test results more clearly and conveniently both in the day and at night includes 1 alcohol tester(This product does not contain batteries)