You can easily measure with just a breath. Easy operation by simply pulling up the cap. Features a sensor usage count display to indicate when to replace it. Alerts when detecting 0.05mg/L or higher. Fast measurement in 5 seconds. Small, lightweight, and convenient to carry. Features an easy-to-read backlight. Power: 2 x AAA alkaline batteries (sold separately) Detection method: Semiconductor alcohol gas sensor Measurement range: 0.00~0.95mg/L (in 0.05mg/L increments) Measurement accuracy: 0.05mg/L Measurement method: Breath-based Display method: LCD display (Backlight turns red and beeps when detecting 0.05mg/L or higher) Interval: 5 minutes Sensor life: 1 year after purchase or over 1000 uses Usage count display: Yes Warranty: Yes (1 year)