What seems to be the problem with some of the fall sensors is what they will detect. If the wearer, for example, trips and falls over and in effect goes down "with a bang" then the sensor picks that up and triggers the alarm. If, as I suspect happens more often, the wearer almost slithers to the floor and then can't get up - say trying to get out of a chair or stand from the side of a bed - then that isn't detected