What should be checked first in electronic keys at saunas and jjimjilbang?

1. This column argues that the facility's environment and operating method should be checked first, not the product name.
2. Columnist Song Jeong-sook cites moisture, temperature changes and battery management as three causes of failure and presents six checklist items.
3. She proposes separate specifications for wet and dry zones, rotational battery replacement, and integrated management of shoe lockers, wardrobes and settlement as conditions for a system with fewer failures.

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