A Small carbon monoxide detector for aircraft and cars that triggers alarms in line with air quality regulations, particularly important for health and occupational concerns for pilots. This product remains on calibration for 3 years. Features Vehicle Uses:Exhaust leaks in vehicles (i.e. Ford Explorer ), aircraft, school buses, trucks & fleet vehicles that triggers headaches, nausea & driver fatigue. Accurate:CO low-level alarm at 9ppm & 25ppm alarms WHO, EPA, ASHRAE, OSHA, NIOSH CO recommended exposure levels. Fast Alarms:Alarms at >9ppm @ 60 secs, compared to home CO detectors that only alarm >70ppm @ 60-240 minutes. Bright RED LED and buzzer alarms. Easy Use:Continuous 12 month operation with same batteries. Easy one button operation. Small form factor (2oz), 3M stick-on mount. Trust:1 year limited warranty. Arrives factory calibrated. 100% product test and verification in the USA. Specifications Item Weight: 2.08 ouncesProduct Dimensions: 2.7 X 1.9 X 0.8 inchesBatteries: 2 Lithium Metal Batteries required. (included)