Advanced flat surfaced alcohol sensor. Quick response. SMD assembling, stable performance. Direct testing process LCD indication. Digital LCD display with blue backlight. Portable and design. Audible warning beyond preset limit. Sensor fault 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 time. Digital Output. saving design. Low battery alert. Instructions included. mouthpieces included. (Mouthpiece not necessary--simply blow into groves for 3-5 seconds) Compact and lightweight design--fits into purse or pocket easily. Easy to . : 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 : 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: 1 * Alcohol Tester 10 * Mouthpieces Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.