Features: portable:easy to carry, can be easily put into your purse or pocket. Suitable for weddings, parties, and other social events to ensure safe driving after drinking. Non-contact detection: Get rid of the traditional contact detection, non-contact blowing detection, direct blowing, no need to replace the mouthpiece, clean and hygienic, to avoid interactive infection. Lighting: The product contains a lighting function, in the off state, press the on button twice consecutively, the emergency lighting turns on. Press the on button again, the lighting turns off. It is convenient to use as a flashlight in emergency. Specifications: Product Name: Alcohol Tester Current: 120mA Battery: 3 Pieces No. 7 batteries (AAA1.5V) (included) Voltage: 4.5V Operating temperature range: -5 ° C~45 ° C Storage temperature range: -20 ° C~50 ° C Detection method: Semiconductor gas sensor Measurement range of alcohol concentration in exhalation: 0-200mg/100mL Measurement object: Alcohol concentration in exhalation Product size: 90mm X 47mm x 23mm Product weight: 45g USE: 1. When using it for the first time, please prepare 3 No. 7 1.5V (AAA) dry batteries, remove the battery cover, instal the battery cover, and then use it again. 2 Press the power button. 3. Warm up"for 1-10 seconds. Start the machine and enter the war-up countdiown of 10 seconds. Please wait for the wamm-up time 4. After preheating is completed, automatically enter the countdown of6 seconds for blowing detection. Wait for the test results tobe displayed. 5. Set dsplay unit Afer completing operation 2.3.4, within 5 seconds of the display result appearing, briefty press once to switch to the next measurement display unit (such as% BAC-US g/1-European mg BrAC-Japan). 6. Short press the power button twice in the shutdown state to tum on the emergency LED lighting: Press the button briefty while the ights are on to tum off the emergency LED ights. Product accessories: 1* Alcohol tester (including battery) 1* User Manual