Main Feature ONE TOUCH OPERATION & AUTO SWITCH OFF--Press the switch for 1s, it will enter into three modes: Warm-up (20s), Blowing and Result showing. Test results will display about 10s on the LCD, and then the tester will automatically switch off. SENSITIVE & ADVANCED SENSOR--Featured with NM Hot-wire alcohol sensor, it is very sensitive. Different levels will have different audio warnings. And it will give a quick response, wait less than 5s after blowing. LCD DISPLAY & AUDIO WARNING--It can automatically remind your safety when the alcohol content exceeds the preset limited level, and send you 'No Driving' icon, 'Hi' and an audio warning. Under the 'Result' mode, clicking the 'Switch Button' can change the unit. It can be suitable for different countries. FIVE PIECES MOUTHPIECES FOR FRIENDS--With 50 pieces mouthpieces which can be cleaned and recycled. That must be much easier for your family or friend to test. PORTABLE & CONVENIENT TO USE--Charged by 3 AAA batteries (not include). With small size, it easily fits in a purse or pocket, hung on a keychain, or placed in car. The result is displayed on the LCD screen with light Blue backup. Even in a gloomy environment, the result will be seen clearly with a wet finger. Specification 1. Accuracy：±10% F.S 2. Alarm concentration：0.24mg/L(0.05%BAC；0.5g/L) 3. Sensor type:Nano Semi-Conductor Sensor 4. Voltage: 3V 5. Preheat Time: 15s 6. Weight: 0.14lb 7. Size: 0.35 x 0.25 x 0.08 inches 8. Color: Black 9. Power Supply: 3 AAA Battery (not included) Package 1 * Breath Alcohol Tester 1 * Free 50 Pieces Mouthpieces Warm Tip 1. After drinking, it is recommended to wait 20 minutes before testing, because alcohol takes about 20 minutes into the blood from the digestive organs, and residual alcohol in the mouth takes time to dissipate. 2. To get a more accurate result, the distance should be at least three minutes between each test. 3. Do not use benzene, gasoline and thinners cleaning product ingredients tester. 4. Do not allow any liquid penetrated into the sensor. 5. Please do not squeeze or smash this Breath Alcohol Tester. 6. To remind you, to you and the safety of others, do not drink and drive. Advanced flat-surfaced alcohol sensor with high sensitivity and quick response. It can give a warning when alcohol content is over 0.052% BAC with smart MCU control. Useful breathalyzer to accurately the body alcohol content(BAC) just by blowing to the instrument.