Professional accuracy: This Breathalyzer delivers BAC results with professional-grade accuracy in a compact body measuring 9.8 x 4.7 x 2.31 cm (3.86 x 1.85 x 0.9 in). It provides reliable readings to help you assess driving safety after drinking. User friendly: Insert the mouthpiece and press the power button. The device preheats in about 10 seconds, then prompts you to blow for about 5 seconds to display your result. It automatically powers off after 15 seconds of inactivity. Compact and portable: Weighing about 70 g, this personal breathalyzer is lightweight and easy to carry in your car, bag, or pocket. Ideal for use at parties, banquets, or social gatherings to support responsible decisions after drinking. Voice alerts and LED display: Clear feedback with sound alerts and LED indicators: green for standard levels (0.00-0.019), yellow for caution (0.020-0.079), and red for drunken (0.08). Use scenarios: In the car before deciding to drive after a night out; at parties or banquets to check BAC before leaving; while traveling or at social events to support responsible decisions.