[Accurate Results] This Breathalyzer is through a sensitive semiconductor sensor that gives you highly accurate results within seconds. With the help of the indicator lights, you can see at a glance that you can judge whether you can drive or not. [LCD Display] This professional alcohol breath tester, equipped with a red backlit LCD display, makes it easy to view the results at night whether you are indoors or outdoors and shows how drunk you are. [Easy to Use] turn on the blood alcohol tester, insert the mouthpiece and wait for the 15 seconds warm-up time. You can accurately measure your blood alcohol level (BAC) and can better assess your fitness to drive. Note: For more accurate test results, please wait 20 minutes after drinking alcohol for using the alcohol tester. [Color Light and Sound Alarm] When the measurement result exceeds 0.5 BAC, the breathalyzer will emit an audible alarm to remind the user that you are drunk. Higher than 0.05%, the red light is on, and on the contrary, the green light is on. The yellow light will be on when the battery is low. After the test results come out, it will automatically shut down for 15 seconds to save battery consumption. [Comes 10 Mouthpieces] The included 10 mouthpieces perfect when you want to share the device with others. Power Suplly:2xAA battery(Not included batteries) Colour:Black Material:ABS Size:120x43x15mm Package Contents: 1 x Alcohol Breathalyzer 10 x Mouthpieces 1 x English manual Only the above package content, other products are not included. Note: Light reflection 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.