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 5V 3xAAA batteries(not included) Working Current: less than or equal to 120mA Environmental temperature:-10° to 50° Relative Humidity less than or equal to 95% Display: 3 digits LCD display with blue backlight Colour: black Material: plastic Package Contents: 3 x Alcohol Tester 30 x Mouthpieces 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.