Advanced flat surfaced alcohol sensor. Quick response. SMD assembling, stable performance. Direct testing process LCD indication. Digital LCD display with blue backlight. Portable and fashion design. Audible warning beyond preset limit. Sensor fault self checking. Battery saved design,low voltage indication. Digital LCD display. Professional Breathalyzer Tester. Breath Alcohol Tester safety for drivers. Breath Alcohol tester needs mouthpiece. within 10 seconds. Broad range. Auto warning beyond pre-set limit. Works EVERY time. Digital Output. Power saving design. Low battery alert. Instructions included. Five mouthpieces included. (Mouthpiece not necessary--simply blow into for 3-5 seconds) Compact and design--fits into purse or pocket easily. Easy to use. Model: AT6000 Detection Range: 0.00 - 0.20BAC% ; 0.00 - 2.00 g/L; 0.00 - 2.00BAC‰ ; 0.00 - 1.00 mg/L; 0.00 - 200 mg/100mL Alarming Threshold: 0.05% BAC; 0.50 g/L; 0.50‰ BAC; 50 mg/100mL Test Accuracy: +/- 10% F.S Working Voltage: DC