Breathalyzer, Portable Breath Alcohol Tester with LCD Display Digital Breath Alcohol Tester for Home Use HIGH SENSITIVE AND ACCURACY  The device is equipped with a high-quality fuel cell sensor module for a long life and accurate results. Do not use the breath analyzer until it has been 20 minutes since the last drink; please wait at least 3 minutes to begin next test after the last test. PORTABLE & LIGHTWEIGHT  Only weighing 1.2 oz, it is small enough to fit in a purse or pockets and any other small space. With backlight LCD display, make it much easier for the night display and give you professional accuracy for safe driving. ENERGY-SAVING BREATHAlYZER  This breathalyzer can set automatic shutdown. Powered by two AAA batteries (not included but usually available), automatically shut down after 5 seconds to save power. Every time you install a battery, you can test more than 80 times. EASY TO USE  Simply insert the two included AA batteries, power on your breathalyzer and begin testing. Your BAC results are displayed 10 seconds later on a bright, easy to read LCD screen. WHAT YOU GET  Package include1 x Breath Alcohol Tester, 5 x Replaceable Mouthpieces, 1 x User Manual, 1 x Key chain and 12-month friendly after sale service.