Welcome to our shop! Product Information: Sensitivity & High Precision: Breathalyzer has high quality semiconductor alcohol sensor capable of converting the input signal into accurate and precise results. Easy to Operate: Breathalyzer is very simple and easy, making blood alcohol testing easy for all. Auto-off Function: Breathalyzer powered by two AAA batteries (Not included), it can automatically turns off to save power. Portable: This professional alcohol breathalyzer can be easily carried in your wallet or pocket everywhere. Great for wedding, parties, feast, banquets or after a drink at the bar, don't drink and drive! Specification: Examination Range: 0.00-0.19% BAC & 0.0-1.9g/L Package Included: 1 x Breathalyzer (With 5 Mouthpieces) Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)