Operating temperature range : -10 - 50 centigrade degree
working voltage: DC 4.5V ( 3 x AAA ) batteries ( not included )
working current: 120mA
Just a quick test and you can drive in confidence.

Main Features:
Professional legal standard BAC unit measurement type only
Efficiency feature: Audio warning beyond pre - set limit， sensor fault self checking， battery saving design， low voltage indication
Sensitive sensor: Advanced flat surfaced alcohol sensor
Light weight， portable and discrete design