Breath alcohol tester is kind of tester designed to measure concentration result of the breathed alcohol in the human body. This device adopts advanced NM Hot-wire alcohol sensor which has excellent sensitivity and reproducibility, fashion and portable design make it more convenient for personal use. When the alcohol content exceeds the preset limited level, this device would send an audio and video warning to remind your safety. Sensor type: NM Hot-wire alcohol sensor. Detection Range: 0.0000.199%BAC; 0.001.99BAC; 0.000.99mg/L. Alarming Level: 05%BAC, 0.25mg/L; 0.5BAC. Accuracy: 10% F.S. Response Time: 5s. Warm-up Time: 20s. Resume Time: 20s. Working Voltage: DC4.5V(3AAA)Batteries; Working Current: 120mA. Working Environment: Temperature -1050 Relative Humidity 95% No Dews. Display: 3 digitals LCD display with blue backlight.