Powered by BACtrack's state-of-the-art Xtend Platinum Fuel Cell Sensor technology, the BACtrack Trace Professional Breathalyzer delivers reliable and accurate BAC results, with police-grade accuracy. From being used as an alcohol detector for employees in businesses to acting as an alcohol tester for patients in clinics or treatment centers, the Trace is perfect for a variety of professional alcohol sensing, detecting and testing applications. And because of its small size and portable design, it's also works great as a personal BAC breathalyzer. Help friends and family make better decisions while drinking with the accurate and affordable BACtrack Trace alcohol breathalyzer. The warm up time is 10-20 seconds and the blowing time is 5 seconds. Note-test subjects should wait 20 minutes after eating, drinking, or smoking before blowing into the bactrack breathalyzer. Failure to wait 20 minutes can provide inaccurate test results and damage the sensor. Operating temperature is 0 to 40 degree celsius