This Breathalyzer is made from polypropylene (PP), providing durable, reliable use for both home and professional settings. User friendly operation: Insert the mouthpiece, press the power button to start. The unit preheats in 10 seconds, then prompts you to blow for 5 seconds to display the result. It automatically powers off after 15 seconds of inactivity. Feedback system: Voice alerts and LED color indicators give clear feedback. Green indicates standard levels (0.00-0.019), yellow indicates caution (0.020-0.079), and red indicates drunken (0.08). Professional accuracy in a compact form: Delivers professional-grade BAC results in a small body measuring 9.8 x 4.7 x 2.31 cm (3.86 x 1.85 x 0.9 in). Use scenarios: Before driving home after a night out, after social events to assess impairment, and for workplace or fleet safety checks to confirm operators are within safe limits.