Features :Advanced Flat Surfaced Alcohol surfaced alcohol sensorQuick ResponseSMD assembling ， Stable PerformanceStart MCU ControlDirect Testing Process LCD indicationDigital LCD Display With Light Blue BackupPortable And Fashion DesignAudio Warning Beyond pre-set LimitSensor Fault Self CheckingBattery Saved Design ， Low Voltage IndicationLight weight， portable and discrete design.Now you can have peace of mind & be certain you are fit to drive.Rapid detect results ， quick response and resume through direct testing process LCD indication.Smart MCU controls ， digital LCD display with light blue backup ， SMD assembling ， stable performance.Just a quick test and you can drive in confidence.Technical Data : Sensor Type Flat Surfaced Alcohol Sensor Detection Range 0.00 - 0.20 BAC%，0.00~2.00g/L，0.00-2.00BAC%o，0.00-1.00mg/L，0.00-200mg/100mL Alarming Level 0.5BAC% ， 0.50 BAC%o ， 0.25mg/L ， 50mg/100mL Accuracy +/- 10% F.S Working Voltage DC4.5V (3 x AAA) - Not Included. Working Current <=120mA Working Environment Temperature -10*C - 50*C Relative Humidity <=95% No Dews Display 3 digits LCD with Light Blue Backup Dimension 103 x 65 x 27mm (LxWxH)Package Includes :1 x Tester device5 x Mouthpieces1 x Instruction booklet (English)