NOTE: 1. For accurate results, please test 20 minutes after drinking as it takes about 20 minutes to absorb alcohol into the bloodstream from the digestive system. If you instantly test after drinking, the result only shows the alcohol concentration in your mouth, rather than that in your blood. 2. To ensure the accuracy of the test result, please wait another 3 minutes before starting the next test. Features Auto-calibration & sensor fault self-checking system, The alcohol tester is extremely easy to use, it comes with a built-in rechargeable lithium battery (1000mAh, 3.7V) that you can use with any USB adapter and comes with a 1 meter micro USB charging cable. Specification Blowing Time: 3~5s Fast response time <5 seconds Accuracy +/- 0.010% BAC (0.1 g/l) Six different testing modes: %BAC-US, g/l-EU, mg/L BRAC-JP, mg/100ml-CN, ‰BAC-RU, ‰prom-PL Recording Recent 32 times testing results Warmup Time =15 seconds Response time = 3-5 seconds Size: about 5.45in x 2.28in x 0.86in Weight: 3.17 oz (115g) Default Warning Value: 0.02% BAC (adjustable) Default Danger Alarm Value : 0.05% BAC (adjustable) SET THRESHOLDS FOR CAUTION and ALARM (based on users’ needs): Results can be distinguished by sound and colour (red for danger, yellow for warning, green for OK). MULTI-FUNCTIONAL DATA STORAGE: Records and saves up to 32 recent testing results. Allows for 6 differerent measurement units (%BAC-US, g/l-EU, mg/L-JP, mg/100ml-CN, ‰BAC-RU, ‰prom-PL). UPGRADED MEMS SENSOR: Advanced High Precision Nanotechnology Sensor gives you accurate values immediately. This breathalyzer uses a built-in 1000mAh lithium battery as the power supply and can be used for 3 months when fully charged. EASY TO OPERATE & PORTABLE. PACKAGE INCLUDES: Breathalyzer, 10 Mouthpieces, micro USB charging cable, black carrying case, and user manual.Best Sellers Rank: See Top 100 in Health & Household. : B09MLGMPW1. Manufacturer: Shenzhen EEK. Date First Available: November 26, 2021. Batteries: 1 Lithium Ion batteries required. (included). Item model number: EK923. Package Dimensions: 6.3 x 4.57 x 2.01 inches; 3.17 Ounces.