SENSITIVE AND ACCURACY - Not sure if you’re ready to drive? AT800 control and Fuel cell sensor-accuracy and reliance Technology gives you fast, accurate and reliable results, , allowing you to decide whether you could drive or not after drinking.and easiest-to-use personal breathalyzer that you can buy." ONE-TOUCH OPERATION - Professional grade dependability. Runs on AAA batteries, you won’t have to worry about recharging this device. With very long battery life and an auto power-off feature, this device will aid you when you need it the most. ABS material makes the device very strong and durable. Simply insert the two AAA batteries, power on your breathalyzer and begin testing. The device will auto turn off after you finished the test for 3 minutes OPTIONAL BLUETOOTH CONNECTIVITY - "Standalone Mode" delivers your results directly on your AT800. "App Mode" wirelessly delivers your results to your smartphone via Bluetooth. Easily switch between modes.