The ALTAIR maintenance-free single-gas detector featuring sensor options for carbon monoxide, hydrogen sulfide and oxygen will operate for over 2 years. Offers superior dust, water protection and high resistance to RFI. A rubberized housing and 1-button operation provide the durability and it is easy to use. The triple alarm system featuring two bright LEDs, an audible alarm, and a vibrating alarm ensures that no alarm condition goes unnoticed. The gas detector automatically records the last 25 alarm events. To read data or change alarm set points, just connect the unit to an MSA infrared adapter using the built-in IR communication port. Patented electrochemical sensors. The oxygen version utilizes fast responding reliable electrochemical sensors. The small and thin sensor profile allows the detector to deliver high performance in a very small package.