Features: You use this personal breathalyzer without for extra mouthpiece, and your mouth doesn'for t need to contact the tester to get a result. The portable alcohol tester is rechargable. You can recharge it by connecting the cable to your car charger or phone charger. You are free of the trouble of changing batteries. This breathalyzer uses highly sensitive semiconductor alcohol sensor. few seconds later after blow, you can get a test result to judge whether you can drive or not. This professional alcohol breathalyzer takes little space, can be easily placed in your wallet or pocket. Excellent for wedding, parties, feast or other social activities to ensures your safe driving after drinking. Specifications: Material: ABS Size: 10x2.7x1.4cm/3.94x1.06x0.55in Press and hold the power button for 1 second, the alcohol tester LCD with turn on with one beep sound. Warm-up mode countdown for 10 seconds. Testing mode countdown from 10 to 00 after warm-up mode, blow at this period. Blow into the breath inhaler for 3-5 seconds with normal power after a deep inhalation. Read the test result from the alcohol tester LCD Testing Range: 0.00%-0.19% BAC & 0.0-1.9 g/L Package Includes: 1x Alcohol Tester note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.