Mobile Chair Self-Releasing Belt Sensor The Posey Self-releasing Chair Belt Sensor is designed to give caregivers the earliest possible warning of a potential fall. The sensor automatically engages the alarm as the belt buckle is closed and sounds the alarm the instant the self-release button is pressed - BEFORE individual tries to get up. The chair belt sensor reminds the individual to request help before getting up and holds the hips firmly yet gently in place for proper positioning, reducing forward sliding. Belt adjusts 21" to 44" L and is 2" wide. Alarm not included. Use with Posey alarms Posey Sitter II #926550 Posey Sitter Select #5528-33 Posey Keepsafe Monitor #926549 Posey Sitter System #9265-50