Features: · Advanced NM hot-wire alcohol sensor : Stable performance · Quick response and resume · Auto power-off · Sensor fault self checking · Audio warning beyond pre-set limit · Blue-colored backlight · Low voltage indicator Description: · Warm-up time: Within 20 seconds · Respond time: Within 5 seconds · Operating temperature range: -10~50°c · Detection range: 0.000-0.199% BAC / 0.00-1.99‰ BAC / 0.00-0.99mg/L · Digital display results (% BAC / ‰ BAC / mg/L) · Power input: 3V (3 x "AAA" alkaline battery, not included) · Smart MCU control · Direct testing process LCD indication · Digital LCD display with light blue backup · convenient and healthful non-touch design · Sensor Fault Self checking