Classic Pull-Cord Alarm: If Pin Connector Is Pulled From The Alarm, The Alarm Will Sound. Activation Cord Adjusts From 18" To 36" And Clips To Patient'S Clothing. Secures To Chair Or Bed With Self- Contained Clip Or With The Included Hook-And-Loop Fastener. On/Off Switch, Two Volume Levels (85 Db Or 100 Db). Uses One 9V Battery (Not Included).