This pressure-sensitive bed alarm by Drive Medical alerts caregiver whenever a patient rises from a chair. The pressure-sensitive pad connects to the audio alarm, which features a safety alert, On/Off switch and low battery warning. Four AA batteries are included to operate the alarm. The chair-sized pad is 11" x 30". Alerts care giver with audio alarm when patient gets out of a chair or bed|Pressure-sensitive pad connects to the audio alarm|The alarm comes with a safety alert, On/Off switch, and low battery warning|Comes with 9V Battery (Included)