Description: Brand new,Portable and fashion designAdvanced flat surfaced alcohol sensor. Rapid detect results, quick response and resumeHigh quality and high accuracy and high sensitivity. After drinking,just a quick test,then you will keep your driving licence saftely.SMD assembling, stable performanceSmart MCU controlDirect testing process LCD indicationDigital LCD display with light blue backup. Audio warning beyond pre-set limitSensor fault self checkingBattery saved design, low voltage indicationJust a quilk check,then you can drive in confidence and safety. Tips For Alcohol Test:Please wait for 20 mins after drinking,then blow to it.Otherwise,it has no reaction.If another person want to test after you,he/she should wait for 5 mins.If the reading exceeds 0.05,the alarm will ring, then you'd better not driving.If the reading is under 0.05, then you are safe to drive. Specification:Sensor: Advanced flat surfaced alcohol sensor Operating temperature range: -10oC~50oC Detectionrange: 0.00-0.20BAC%; 0.00-2.00g/L;0.00-2.00BAC; 0.00-1.00mg/L;0.00-200mg/100mL Alarming Level: 0.05BAC%; 0.50g/L; 0.50BAC;0.25mg/L; 50mg/100mL Power: 3 x AAA Battery (not included) Accuracy: 10% F.S Working Voltage: DC4.5V(3xAAA) Batteries;