When you use the two-year versions for H2S or CO, you can hibernate the detector when you’re not using it for a week or more — and extend its life by that period of time, for up to a year. Holding a supply of detectors for a plant turnaround? Facing a few months between projects? Have workers going on leave? Hibernate each detector to preserve its life, and you can spread your detector’s 24 months of operation over up to three years instead of the standard two.