Mini Breathalyzer Digital LCD Diagnostic Tool Professional Alcohol Tester Car Detector For Drivers Steps For Usage： 1. Put 3Pcs "AAA"Batteries(Not Included in the Package) in 2. Insert the Mouthpiece into any side 3. Press the Button Warm Up 10s 4. After the warm-up is complete, blow gas rapidly and continuously until the digital flow rate is displayed. 5. Detection Range: 0.00-0.20% BAC 100% Brand New and High Quality！ Features: Improved flat surfaced alcohol sensor. Quick response. SMD assembly, stable performance. Direct process check LCD indication. Digital LCD with blue backlight. Portable and fashionable design. Audible warning for predefined restrictions. Sensor malfunction check. Battery saving, low voltage indication. Digital LCD display. Specifications: Model: AT6000 Detection Range: 0.00-0.20bac%; 0.00-2.00 g / l; 0.00-2.00bac ‰; 0.00-1.00 mg / l; 0.00-200 mg / 100 ml Alarm threshold: 0.05% BAC; 0.50 g / l; 0.50 ‰ BAC; 50 mg / 100 ml Test accuracy: ± 10% f. S Operating voltage: DC 5V 3 xAAA batteries (not included) Working Current: ≤120mA Ambient temperature: -10 to 50 ° Relative humidity ≤95% Display: 3 digits LCD with blue backlight Battery Life: ≥2000 times Size: 103x65x27 mm (LxWxH) Weight: 76.5g Package Included: 1 x Alcohol Tester 5 x mouthpiece Note: This item comes without a retail box, but please rest assured that we will pack it well before shipping!