mixed review on chair and bed alarms
In general this is a good product, but we've found the short delay between when the person gets up from a chair and when the alarm begins to sound is just enough for my Dad to make it to his feet -- or to fall in front of the chair.  The bed alarm is a bit better since it takes longer to first sit up and then begin to stand, so the caregivers usually  have enough warning to reach him in time.
Rating: 3 stars