Non contact alcohols analyzer: Safe noncontact design, no need to touch directly, ensuring measurement hygiene. Built in precision solidstate sensor for detection of alcohols levels, suitable for self testing before drinking and driving. Easy for operation: When charging, the red light will turn on and turn off when fully charged. After preheating for 15 seconds, blow air for 5 seconds, and after 3 seconds, the LCD screen will display the result. Portable design: Compact and lightweight, easy to fit into a wallet or pocket. Equipped with a hanging rope for easy carrying or hanging. Tri color light and sound alarm: If the test result exceeds the standard, the alcohols tester will light up the warning light and emit a buzzing sound to remind not to drive. Use scenarios: safety before driving: Use after social events or meals to decide if it is safe to drive. On the go practicality: Quick checks at a bar, party, or before leaving a venue, or before operating a vehicle or heavy equipment. Gift or practical accessory: A portable safety device suitable as a gift for family, friends, or coworkers who drive or travel frequently.