If buying a motion sensor, should we select? one with recordable message, alarm or silent pager to caregiver? want to prevent falls if 92 yo arises.

Difficult choice ...: If you want to prevent falls (and who doesn't?), you need someone there immediately as soon as your 92yo starts stirring. In middle of night, by time someone elsewhere in house wakes up to silent pager, it may be too late. I certainly don't think a recordable message (?) will be enough, regardless if for 92yo or for caregiver. An alarm might actually frighten 92yo regardless if demented or not.