12 Interchangeable Mouthpieces Breathalyzer comes with 12 pieces of mouthpieces, which can be cleaned and reused. Featuring a compact design, the breathalyzer fits easily in your pocket and is convenient to carry. Ideal for personal use by drivers. This breathalyzer features a professional airway design and a high-precision semiconductor sensor for accurate and fast blood alcohol concentration (BAC) testing. Measures BAC range from 0.00% to 1.9% (0.0 to 1.9 g/L). Alarm function activates when BAC exceeds 0.05% (0.25 mg/L or 50 mg/100ml), emitting an ble alert to discourage operation of vehicles. Equipped with a backlight for easy reading in low light. Simple to use: insert 2 AAA batteries (not included), turn on the device, allow 20 seconds for warm-up, then begin testing. The device automatically powers off after inactivity to conserve battery. Package includes: 1 x Breathalyzer, 12 x Mouthpieces, 1 x User Manual.