Low level carbon monoxide detector in the worlds smallest package * Weighs less than 1.5 ounces, fits on key ring * Applications include home inspections, smoking cessation, fire fighting, first responders, HVAC and more * Easy operation-one push of the button results in self test, temperature display, ambient CO level in ppm units, an audible beep begins and repeats if safety levels are exceeded and shuts off after 5 minutes * Adults