12 Interchangeable Mouthpieces Breathalyzer includes 12 reusable and washable mouthpieces. Compact and portable design fits easily in your pocket, making it convenient to carry. Ideal for personal use by drivers. Features a professional airway design and high-precision semiconductor sensor for accurate and fast blood alcohol concentration (BAC) testing. Measures BAC range from 0.00% to 1.9% with high reliability. Equipped with an alarm that activates when BAC exceeds 0.05%, providing an audible alert to discourage impaired driving. Backlit display ensures easy reading in low-light conditions. Simple to operate: insert 2 AAA batteries (not included), power on, allow 20 seconds for warm-up, then begin testing. Automatically shuts off after inactivity to conserve battery. Package includes: 1 breathalyzer device, 12 mouthpieces, and user manual.