Features: Advanced planar alcohol sensor. Quick response. SMD assembly, stable performance. Direct test process LCD display. Digital LCD display with 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, including instructions. (No mouthpiece required - just blow in for 3-5 seconds) Compact and lightweight design fits easily into a purse or pocket. Easy to use. Package includes: 1 X Alcohol Tester Power supply: 3 AAA alkaline batteries (you need to bring your own, batteries are not included)