Features: 1.High accuracy, specially designed for detecting the wine content of human breath, very practical. 2.It adopts advanced namo semiconductor wine sensor, which has good sensitivity and excellent repetitive function and a variety of applicable capabilities. 3.Backlit LCD screen, digital character display, and it is clear, straight for you to see. 4.When the wine content in the tested breath exceeds the preset value, the device will send out an alarm signal to remind you to pay attention to safety. 5.Compact and portable design, only 15x5.5x2.5cm/5.9x2.2x1in of size, easy to use, no complicated operation. Specification: Item Type: Breathalyzer Color: Black Material: ABS Size: Approx. 15x5.5x2.5cm/5.9x2.2x1in(Please allow 1?2mm difference due to manual measurement.) Sensor Type: Nano semiconductor wine sensor Working Power: DC4.5V (3pcs AAA batteries, not included) Use Environment: Temperature: -10-50C Relative Humidity: Less than 95%, no frost Alarm Mode: Blue backlit 3-digit LCD data comparison photo display Exhaled Blood Wine Concentration (BAC): Driving: 20mg/100ml, 0.0909mg/L Drunk Driving: 80mg/100ml, 0.3636mg/L Note: Please allow 1?2mm difference due to manual measurement.