QUESTION: How does it work? My wife has Parkinson's & sometimes tries to climb over the bed rail or get out the bottom. Would alarm signal these? Would it go off if she just sat up? Is it battery operated or what? ANSWER: The infrared alarm alerts staff if patient tries to get out of bed. This passive infrared alarm affixes to the headboard or bed frame, allowing patient to move freely within bed. So if your wife tries to get out of the bed it will alarm but if she just sits up it will not. It is battery operated. For more discussions, options and details about the product, or to order the product, please click here The infrared alarm alerts staff if patient tries to get out of bed. This passive infrared alarm affixes to the headboard or bed frame, allowing patient to move freely within bed. Shipping is free. If patient attempts to leave bed, the infrared beam detects motion and sends out your choice of alarm or chime tone.  When connected to the nurse call system, the alarm can be set to "remote", which keeps the alarm silent in the room but sends a signal to the nurses' station.  Alarm head swivels for precise beam alignment.  Attach using the bracket (optional) or hook and loop strips (included).  Uses 9V battery (not included).