Features: Advanced planar alcohol sens. Quick response. SMD assembly, stable perfmance. Direct test process LCD display. Digital LCD display with blue backlight. Ptable stylish design. Audible warning outside of preset range. Sens 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. wk every time. digital output. Power saving design. Low battery alert, including instructions. (No mouthpiece required - just blow in f 3-5 seconds) Compact lightweight design fits easily into a purse 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)