[Non-contact design]: The alcohol tester adopts a non-contact design, which is healthier and than directly entering the tester. Your mouth can results without touching the tester.[Easy to use]: The alcohol breathalyzer can measure the alcohol concentration in your breath just by exhaling. It can be used in various venues such as parties and business[High Accuracy]: digital respirators are designed with an ultra- semiconductor sensor system that will tell you if your alcohol content exceeds the 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 .[Portable Size]: The alcohol tester is small and light, easy to carry. It can be with a USB cable, and can be through a mobile phone charger or a computer USB port.Power adapter requirements: DC5V 1ATest range: 0.00-0.19%BAC(0-1.9g/l)Warm-up time: 10 secondsBlowing time: within 10 seconds, more than 4 seconds requiredResponse time: less than 5 secondsWorking current: 250MA (max)Standby current: less than 20UAColour:As shownMaterial:plasticPackage Contents:1 x Alcohol detector1 x USB cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.