[ High Accuracy Breath Alcohol Tester ] - This alcohol breathalyzer adopted a high-precision semiconductor alcohol sensor, can real-time response and resume, minimize the mistakes; provide you professional grade accuracy which rechargeable and has a long service life [ Energy-Saving and Auto-off ] - Powered by 2 x AAA batteries( not included, but commonly available), this breathalyzer will automatically shut off to save power after finishing the test for 10 seconds [ Easy to Use ] - Warm up for 10 seconds and blow into the breath inhaler for 3-5 seconds, then read the text result from the alcohol tester LCD screen; the result will display about 10 seconds and then will automatically switch off (Please test several times for first time use) [ Portable Designed Breathalyzer ] - Space-saving, lightweight, portable, easy to hold and carry, can put it on your bag or pocket, stay with your when driving; great for wedding, parties, or other activities, ensures your safe driving [ 5 Mouthpieces for Replace ] - Comes with 5 replaceable mouthpieces, maintain health and hygiene alcohol test; And the 5 mouthpieces can be cleaned and recycled, making recycling more environmentally friendly