Alcohol tester* 3 test levels show by LED lightsGreen- BAC value:less than or equal to 0.02% BAC; Yellow-BAC value:0.02-0.05% BAC; Red-BAC value:great than or equal to 0.05% BAC* Clock function: real time, alarm time, countdown timer.* Power input:    Tester: 3V (2 x AAA alkaline battery,not included)    Clock: 1.5V (1 x AG13 Cell Button, included)* Unit size: 91 x 31 x 17.5 mm

* Packing: color box

* Carton size: 100pcs/ctn; 43*30*25cm