Alcohol tester: Based on high-precision chips, it has stable performance, strong anti-interference, and smart sensor measurements are more accurate. TFT high-definition display, clear at a glance. The air blow type is more hygienic without touching.Long lasting battery life: USB charging does not need to replace the battery, high-capacity lithium battery, can be used 300 times once charged.Built-in purification chamber: only alcohol is left, other impurities are filtered, only alcohol is left, and the detection is more accurate.Three-color indicator light, distinguish the numerical level, Drunk driving with alarm reminder.Usage steps: It is recommended to start the test 20 minutes after drinking to be more accurate. 1. Press and hold to power on, wait for 10 seconds after the di sound. 2. After the di sound again, blow air. 3. Wait 10 seconds after blowing to see the test result.Specification:Test range: 0.000~0.199%BACAccuracy voltage: 0.005% BACVoltage: 3VResponse time:Less than 5SBlowing time: 10 seconds (usually 3-5 seconds)Warm-up time: 15sProduct size: 60x31x19mmPower supply: USB charging interfaceWeight: about 24gCOLOR: blackmaterial: plasticPackage Contents:1 x Alcohol TesterOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.