Alcohol tester: Based on high-precision chips, it has stable performance, strong anti-interference, and smart sensor measurement is more accurate. TFT high-definition display, clear at a glance. Air blowing is more hygienic and requires no contact. Small and portable: Surface shell is brown translucent craft, smooth to the touch, lightweight and compact, preventing drunk driving. Long-lasting battery life: USB charging without changing the battery, high-capacity lithium battery, can be used 300 times on a single charge. Built-in purification chamber: only retain alcohol, filter other impurities, only retain alcohol, and the detection is more accurate. Three-color indicator light, distinguishing high and low values, warning for drunk driving. Usage steps: It is recommended to start the test 20 minutes after drinking to be more accurate. 1. Long press to power on, wait for 10 seconds after the "beep" sound. 2. After another "beep", blow air. 3. Wait for 10 seconds after blowing to see the test result. Specifications: Test range: 0.000~0.199%BAC Accurate voltage: 0.005% BAC Voltage: 3V Response time:.Items from Sheng Xinshun's shop