This alcohol tester adopts advanced sensor technology , can give you a accurate and result in few seconds. Quick response and resume , easy to operate. Small size , lightweight and easy to carry.Features:1. Adopts advanced sensor technology , can give you a accurate and result in few seconds. 2. Quick response and resume , good accuracy , easy to operate. 3. Small size and lightweight , easy to put in purse or pocket.4. One button operate , easy to use , just need you press the switch.5. Auto power off design , energy saving. Digital alcohol tester with audible alert , more intuitive and convenient.6. LCD backlight display for easy reading.Specification:Item Type: Alcohol TesterMaterial: PlasticColor: WhiteBattery Type: 2 * AAA( Not Included )Sensor: Advanced Semiconductor Oxide Alcohol SensorRange: 0.000% 0.199% BAC (0.00 1.9g ,L)Accuracy: ±0.01%BACWarm up Time: 10sResponse Time: ＜5sDisplay: LCD DisplayItem Size: 9.5 * 3.5 * 1.3cm , 3.7 * 1.4 * 0.5inchPackage Weight: Approx. 36gPackage List:1 * Alcohol Tester1 * Hanging Rope1 * English ManualNote:1. The status Warm Up number will jump from 10 to 0 , and then the state Blow from 10 jumps to 0 to complete the warm up procedure.2. Start the countdown to 6 seconds and stick the mouth close to breath test sensor , and exhale into the sensor for 3 5 seconds.