ALTAIR® Maintenance-Free Single Gas Detector-Innovative and effective, the ALTAIR® Single Gas Detector features an excellent triple alarm system, an IP67-rated rubberized armor housing and one-button operation.Warranted for two years (averaging two alarm minutes per day) or 1,080 alarm minutes with no maintenance, ALTAIR® will not deactivate at that time, but will continue to deliver as long as the high-capacity lithium battery and sensor performance allow. Patented MSA-built Button™ toxic gas sensors feature stainless steel construction and contain solid electrolyte, virtually eliminating the possibility of sensor leakage. Built-in IR communication makes retrieval of the automatically stored 25 latest alarm events easy for assessment.