1. alcohol tester has additional memory function to store up to 50 groups of test results. 2. Non-contact breathalyzer needs no disposable mouthpiece. Designed with a purification room that purifies distractors leaving only alcohol, the sensor show you the alcohol concentration in high precision. 3. digit display show you the alcohol test result intuitively. 4. USB rechargeable, the high-capacity lithium battery lasts long on a full charge. 5. Portable and easy to store, the breathalyzer is great for home use, outdoor camping, carnival, and more occasions, place it in your car and test your breath when you need it. Please note:the physical slightly color or difference, does not affect the use, please do not mind, thank you! Attention: 1. It takes at least 20 minutes for alcohol to be absorbed from the digestive system into the blood system. So it is recommended to test 20 minutes after drinking. 2. Please do not directly wipe the product with chemicals or solvents to prevent liquid from flowing into the blowing hole. 3. If tested under low battery conditions, there be a certain deviation between the test value and the actual value. Colour:Green Material:Plastic Package Contents: 1 x Alcohol Tester 1 x English instruction 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.