Description: High Precision & Sensitive: This alcohol tester adopts high precision & sensitive alcohol sensor and smart chip, uses the structure of impurities filtering, which can generate accurate results. Non contact & Hygienic: No blowpipe to avoid secondary pollution, Contactless breath testing helps avoid breeding bacteria. LED Display & Emergency Alarm: A high contrast LED displayascreenis easy to read with values in two units. Light/Beep Warning. Different indicator lights will turn on according to the content of alcohol. If overdrink, the beep will sound.(Pass: green light on. Drank: yellow light on with beeps. Drunk: red light on with beeps)  Safe & Rechargeable: A large capacity lithium battery can be used for 3 months after fully charged. Designed to be charged from type . Small & Portable: Professional alcohol tester is compact and portable, can be easily carried in your wallet or pocket. This alcohol tester provides for wedding, parties, feast social activities to ensure safe driving after drinking. Specification: Type: Digital Alcohol Tester Charging Time: About 2-3h Input:5V/0.12A(Max) Weight: 292g Material: ABS  Color: Black How To Use 1.Rotate the button knob to turn it on and wait for 10s. 2.Blow continuously towards the air inlet away from 10cm. 3.The value result is shown on the display after waiting for 10s Size Chart: Dia: 25mm/0.98inch Lenth: 80mm/3.15inch Package Includes: 1 Piece Digital Alcohol Tester 1 Piece Holder 1 Piece Charging Cable Note: 1. Wait at least 20 minutes after drinking before testing.  2. Please do not directly wipe the device with or solvents to prevent liquid from flowing into the mouthpiece. 3. If the test is conducted with a low battery, there might be deviation between the test result and the true value.