MSA's ALTAIR single-gas detector provides over two years of maintenance-free performance (depending upon alarm minutes used). Long life, cost-effective single-gas detectors offer outstanding dust and water protection and feature a distinctive triple alarm system. Two bright LEDs and piercing audible alarm with standard vibrating alarm help to ensure that no alarm condition goes unnoticed. Rubberized armor housing and one-button operation provide durability and ease of use. Units will not deactivate after two years of operation; instead will perform as long as battery capacity and sensor performance allow. Built-in calibration feature enables users to potentially further extend instrument life. ALTAIR single-gas detectors are part of MSA's ALTAIR detector family of products.