accuracy and strong antiinterference: This blown alcohol detector remains reliable even in challenging environments and is not easily affected by ambient smells. It can accurately measure your blood alcohol content within seconds. Simple and fast operation: To use, press the power button for 1 second to turn on the alcohol tester, then wait about 10 seconds for warmup. Blow into the respirator for 35 seconds and the result is shown on the LCD screen. The red backlight design enhances readability in various lighting conditions. Energysaving and durable: This tester is powered by 2 AAA alkaline batteries (not included). It responds in about 5 seconds and includes an automatic shutdown function to conserve power. Portable and convenient: The unit is mini and compact, easily fitting in a wallet or pocket. It can be hung on a key chain or placed in a car for quick access. Practical use scenarios: Before driving: Quickly verify whether you are within a safe blood alcohol level to decide if it is safe to drive or if alternative transportation is needed. Workplace and facility safety: Use for quick checks before operating machinery, entering restricted areas, or complying with company policy on alcohol use. Social events and travel: Check impairment levels after social activities to determine if it is appropriate to drive, ride with a sober driver, or use other transportation options.