Unlike fall detection devices, which use wearable motion sensors or environmental sensing to classify a movement pattern as a possible fall and trigger an alert, emergency alert buttons send a manual request for help when a user presses a wearable or fixed button, relying on reach, deliberate activation, radio or cellular connection, response-center routing, location information, battery, and an agreed emergency plan.
The word instead makes this a use-case decision, not a comparison of feature quantity. A situation favors emergency alert buttons when the required job is to send a manual request for help when a user presses a wearable or fixed button. A situation favors fall detection devices when the required job is to use wearable motion sensors or environmental sensing to classify a movement pattern as a possible fall and trigger an alert.