Advanced flat surfaced alcohol sensor, high sensitivity rapid detect results, quick response and resume smd assembling, stable performance smart mcu control direct testing process lcd indication digital lcd display with light blue backup portable and fashion design audio warning beyond pre-set limit sensor fault self checking battery saved design, low voltage indication color: black lcd backlight: blue sensor: advanced flat surfaced alcohol sensor operating temperature range: -10oc~50oc detection range: 0.00-0.20 bac%; 0.00-2.00g/l;0.00-2.00bac‰;0.00-1.00mg/l;0.00-200mg/100ml alarming level: 0.05bac%; 0.50g/l; 0.50bac‰;0.25mg/l; 50mg/100ml accuracy: ±10% f.s working voltage: dc4.5v(3xaaa) batteries;working current: