[Non-contact design]: The alcohol tester adopts a non-contact design, which is healthier and than directly entering the tester. Your mouth can get results without touching the tester. [Easy to ]: The alcohol breathalyzer can easily measure the alcohol concentration in your breath just by exhaling. It can be used in various venues such as parties and business [High Accuracy]: Our digital respirators are designed with an ultra-sensitive semiconductor sensor system will tell you if your alcohol content exceeds the legal limit to driving safety. [LED Display]: The alcohol detector is equipped with an LED digital display. Green light - do not drink, yellow light - drink, red light - drunk. If the LED lights up red, a warning tone will sound quickly. The results are clear at a glance. [Portable Size]: The alcohol tester is small and light, easy to carry. It can be easily charged with a USB cable, and can be charged through a mobile phone charger or a computer USB port. adapter requirements: DC5V 1A Test range: 0.00-0.19%BAC(0-1.9g/l) Warm-up time: 10 seconds Blowing time: within 10 seconds, more than 4 seconds required Response time: less than 5 seconds Working current: 250MA (max) Standby current: less than 20UA Colour:As shown Material:plastic Package Contents: 1 x Alcohol detector 1 x USB cable Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.