Specifications: ·Efficient range: 0.00 - 0.20%BAC0.00 - 1.00mg/L; 0.00 - 2.00g/L Two level alarming:1st 0.02%BAC, 2nd 0.05%BAC.0.12mg/L, 0.25mg/L; 0.25g/L, 0.50g/LWorking Voltage : DC3V (2×AAA batteries)Using Environment: Tem. 0~45° Relative Hum.< =95%(No Dews)Alarming Manner : LED 1st Level: Yellow LED2nd Level: Red LEDPower: 2 × AAA batteries Package:Excluding batteriescolor:silver or black