1[Accurate Test] Handheld alcohol tester has built in purification chamber, only leaves alcohol, filters other impurities, and the detection is more accurate. 2[Sensitive] Alcohol detector has built in high sensing chip accuracy chemical sensor, based on high accuracy chip, smart sensor measurement is faster and more accurate. 3[Safe And Hygienic] Non contact type breath alcohol tester, quick inspection, no need to blow the pipe, avoid the breeding of bacteria in the blow pipe, healthier. 4[3 Color Indicator Light] Alcohol detector adopts a 3 color indicator light design, which is convenient for determining the alcohol concentration and clear at a glance. 5[USB Charging] Breath alcohol tester has a built in 250mAh battery, which is rechargeable by USB and has a long battery life to meet the needs of outdoor use.