Worth prioritizing: a long battery backup in case of a power outage, water-resistant buttons (bathrooms are a common fall site), a comfortable band or clip people will actually keep wearing, and clear two-way voice quality.
Less important than the marketing suggests: extra button colors, app dashboards nobody in the family will check, and long lists of 'smart home' extras. A device only helps if the person wears it every day — comfort and simplicity often matter more than a longer feature list.
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