Portable Gas Detector Delivers Safety At The Speed of Now! Introducing MSA's newest gas detector to hit the market, the ALTAIR 4XR. The MSA ALTAIR 4XR features Bluetooth connectivity, paving the way for a new world in safety management. The new MSA ALTAIR 4XR Multigas Detector provides real time event notification using Bluetooth connectivity. This tough and reliable 4-gas monitor with proven MSA XCell Sensors is among the fastest in the world, and when paired with the MSA ALTAIR Conne …