Features: Brand new high quality portable to carry around, test your BAC anytime, anywhere. Get a quick estimate of your blood alcohol level with this small, non-contact breathalyzer. No need to worry about forgetting to install the mouthpiece or hygiene issues, it is more convenient and safer to blow directly to the tester inhaler without the mouthpiece. Easy to use, light weight, low power consumption, automatic shutdown, backlit LCD display, three-color indicator light, test results at a glance, dust-proof design, slide up to close the air inlet, long-term use How to use: 1. Press and hold the power button for 1 second, the alcohol tester LCD will turn on with a beep. 2. The preheat mode counts down for 10 seconds. 3. The test mode counts down from 10 to 00, at which time the preheat mode sounds. 4. Blow into the respirator with normal power for 3-5 seconds after inhaling deeply. 5. Read the test results from the alcohol tester LCD. 6. Test range: 0.00%-0.19% BAC & 0.0-1.9 g/L Specifications: Warm-up Time: Within 10 seconds Power Supply: 200mA Lithium Battery Unit: G/L %BAC Indicator: Green Orange Red Dimensions: 10cm / 3.94 inches x 2.7 cm / 1.06 inches x 1.4 cm / 0.55 inches. Material: ABS Color: Black Silver Icon Meaning: Note: Warning State Dangerous: Dangerous State Preheat: (Ready State) OFF: (Power Off) BLow: (Blowing State) Result: (Test Result) Indicator Light Meaning: Green: None Alcohol Orange: drinking status Red: drunk status Package Included: 1 x Alcohol Tester 1 x USB Cable 1 x Instruction Manual No retail box. Safely packaged in a bubble bag.