Keith_McClary
- 752
- 1,506
The date is to replace the detector after 10 years. I can't find why 10 years exactly, it just seems to be a typical lifetime of electronics if high reliability is required. (I have lots of ancient electronics that still sort of work.)WWGD said:Don't batteries expire? Edit: Date is to know when to reolace batteries, as detectors are powered by batteries.