Description:  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.  Small and portable: The Surface shell is brown translucent craftsmanship, smooth to the touch, light and compact, prevent drunk driving.  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%BAC  Accuracy voltage: ±0.005% BAC  Voltage: 3V  Response time:<5S  Blowing time: 10 seconds (usually 3-5 seconds)  Warm-up time: 15s  Product size: 60x31x19mm  Power supply: USB charging interface  Weight: about 24g  material: plastic  Package Includes:  1 x Alcohol Tester  1 x Data Cable  1 x Manual  Note:  1. Please allow slightly error due to manual measurement.  2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.  3. Wish you a wonderful on-line shopping