BRAND NEW IN BOX. The MSA Altair 4XR is Outfitted with rapid-response MSA XCell® sensors, making it one of the most advanced gas monitors on the market today. ALTAIR 4XR Gas Detector's are 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 4XR Gas Detector. Condition is New. Shipped with USPS Priority Mail.