high quality FAST AND HIGH ACCURACY The breathalyzer with professional airway design and high-precision semi-conductor sensor. Alcohol breathalyzer detect trace amounts of alcohol only need 25 seconds, reliably handles high BAC levels and is accurate to the third decimal place. ONE TOUCH OPERATION The are extremely easy to use. Simply insert the three included LR03 AAA batteries(not included), power on your breathalyzer and begin testing. You are able to easily change units of measurements and set user-define PERFECT LED SCREEN With blue LED display, it will be much easier for night viewing. It will be auto shut off to save power after you finished the test for 20 seconds. LCD screen flicker shows that it is in low battery. FIVE PIECES MOUTHOIECES FOR FRIENDS Alcohol breath analyzer come with 5 pieces mouthpieces which are placed on the back of the device, and the mouthpieces can be cleaned and recycled. Will be much easier for your family or friend to test. Package weight: 0.245 kg Product size (L x W x H): 15.00 x 10.00 x 4.00 cm / 5.91 x 3.94 x 1.57 inches Package size (L x W x H): 16.50 x 11.80 x 4.50 cm / 6.5 x 4.65 x 1.77 inches Package Contents: 1 x Alcohol Tester , 5 x Mouthpiece