The MSA ALTAIR Pro is a single-gas detector that provides reliable performance for detecting oxygen or toxic gases through user-replaceable sensors. It has a rugged, waterproof and dustproof design that allows for 2 years of maintenance-free operation. The device has simple one-button operation and provides alarms through flashing lights, audible sounds, and vibration to alert the user if hazardous gas levels are detected. It is suitable for accurately measuring various gases and offers adjustable alarm settings.