1Healthier and more hygienicThis blood alcohol meter does not require lip contact, just blow it directly into the mouthpiece. Dust-proof design, press the switch, blow directly into the tester, without lips, without touching the breathalyzer. 2Audio Alert & Lcd DisplayWith Lcd display, you can see the result clearly and remind you with 3 colors whether the alcohol test result is safe or not. Green is safe, yellow is warning, and red is dangerous. If the measured value is at or above the alarm concentration, the breathalyzer will turn on a red light and simultaneously emit a rapid beep. 3USB Rechargeable and DurableThe alcohol tester can be charged with a USB cable. Compared with regular Aa batteries, it is easy to charge and environmentally friendly. USB charging can be charged through a mobile phone charger or a computer USB port. When no operation is performed, the breathalyzer will turn off to save power. 4Portable Mini RespiratorPortable respirator mini size, small size, easy to carry, can fit into pocket or purse or other small spaces, perfect for weddings, parties, celebrations and other social events. 5Font AccuracyBlow 5-10 seconds, the result is ready in seconds and displayed on the LED screen for 10 seconds.