Detection method: semiconductor gas sensor Measurement range of alcohol concentration in breath: 0-200mg/100mL Exhalation time: 10s Measurement object: Alcohol concentration in breath Use range temperature: -5℃-45℃ Customs declaration temperature range: -20℃-50℃ Instructions for use (it is recommended to the test 20 minutes after drinking, which is more accurate): 1. the power button, and prompt "Please wait for preheating" the preheating and wait for 10 seconds 2. Voice prompt "Please blow" countdown within 10 seconds and blow for more than 3 seconds 3. Voice broadcast test results or view test results according to the light Function: Emergency escape without obstacles: built-in stainless steel cutter, seat belts can be quickly cut off in critical moments, easy to operate Three-color detection indicator light: red light for drunk driving, yellow light for drunk driving, green light for not exceeding the standard Colour:Black Material:ABS Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Breathalyzer Only the above package content, other products are not included. Note: Light reflection 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.