Sense gas 2X faster than the industry average with XCell® sensors. Quickly update MSA ALTAIR 4XR settings via the ALTAIR Connect app. Survives 25 drops from 4' (1.2 meters) (MIL-STD-810G drop protection). Dust- and waterproof IP68 rating (2 meters for at least 1 hour). Operating temperature range: -40° F to +140° F. Four-year instrument and sensor warranty. Charcoal case.