This breathalyzer can measure the alcohol concentration in the exhaled breath just by blowing on it, nd it is healthier and safer than the direct inlet type. It is designed with ultra-sensitive semiconductor sensor system, which can ensure that your alcohol content is determined within a few seconds, help you make the right decision when drinking, and ensure driving safety. This breathalyzer uses an LED display to easily view the displayed values even in the dark of night. With the indicator light, you can see the test result at a glance. Please note that the red light means drinking, the green light means alcohol-free and safe, and the yellow light means drinking. The portable breath tester comes with a key chain, and you can prevent it from being lost with a car key and chain. With a space-saving, lightweight, portable design, only the size of a pocket, it is completely easy to carry and carry anywhere. Breath alcohol analyser convenient recharge by using USB cable. It can be connected directly to a USB adapter, mobile battery, in-vehicle charger, PC, etc. for quick charging. Measurement Accuracy: 99% Warm-up Time: 10s Response Time: 10s Crowd: People Who Drink and Drive Voltage: 5v Power: Built-in Battery Weight: 140g Size: 83 x 22mm Package List: 1 x Breathalyzer