Features: Advanced planar alcohol sensor. Quick response. SMD assembly, stable performance. Direct test process LCD indication. Digital LCD display, blue backlight. Portable and stylish design. Audible warning outside of preset range. Sensor failure self-test. Battery saving design, low voltage indication. Digital LCD display. Professional Breath Alcohol Tester Breath Alcohol Tester Safety Driver Breath Alcohol Tester requires mouthpiece to warm up a wide range within 10 seconds. Automatic warning of exceeding preset limits. work every time. digital output. Power saving design. Low battery alert. Instructions included.10 mouthpieces included. (No mouthpiece required - just blow into the woods for 3-5 seconds) Compact and lightweight design - fits easily into a purse or pocket. Easy to use.Detection range: 0.00 - 0.20BAC percent 0.00-2.00g or L 0.00 - 2.00BAC percent 0.00 - 1.00mg or L 0.00 - 200mg or 100mlAlarm threshold: 0.05 percent BAC 0.50g or L 0.50BAC 50mg or 100mlTest accuracy: 10 percent F.SWorking voltage: DC 5V 3xAAA battery (not included)Display: 3-digit LCD with blue backlightExpected battery time: 2000 timesDimensions: 103 x 65 x 27mm (LxWxH)