Outfitted with rapid-response MSA XCell® sensors, the ALTAIR 4XR Gas Detector is the toughest 4-gas monitor on the market and is backed by a 4-year warranty. The ALTAIR 4XR can also provide real-time incident awareness to team members, supervisors, safety managers and others when paired with the MSA ALTAIR Connect app via a Bluetooth® wireless connection. MSA Altair® Multi-Gas Detector, 4XR, LEL/O2/CO/H2S Gas, -40 to 140 °F Operating, IP68 Enclosure, 1.37 in L x 3 in W x 4.4 in D Dimensions