Feature: Brand new and high quality The upgraded portable alcohol tester uses advanced aviation-grade semiconductor materials and a new C+ language calculation method to make the test results more accurate and the test results of 2 units clearer. Lower than warning value: Make a "di" sound and the light will turn green. Between warning value and dangerous value: Make sound as "di di" and the light will turn yellow. Higher than dangerous value: Make sound as "di di di..." for about 10 seconds. The light will turn red Specification: Warm-up time:within 10 seconds Power supply: 300mA lithium battery Unit: G/L, %BAC Indicator light: green, orange, red Size:9cm/3.54inch x 2.7cm/1.06inch x 2.7cm/1.06inch. Material:ABS Color:Black Package Included: 1 x Alcohol Tester 1 x USB data cable 1 x Bag 1 x Box NO Retail Box. Packed Safely in Bubble Bag.