Safe-t mate® Anti-Rollback System helps prevent wheelchair falls. High-fall-risk patients with memory or cognitive issues often inadvertently stand without manually securing their wheelchair brakes, allowing the wheelchair to roll away while putting them at risk of sustaining serious fall-related injuries. The Anti-Rollback System's weight-sensitive braking mechanism automatically locks rear wheelchair wheels when a patient stands, helping to reduce incidences of harmful falls. How it works: As the patient rises from the wheelchair, the weight-sensitive seat lever engages upward, lowering the brake arms to secure the wheels. When the patient sits, the brake arms unlock automatically, allowing the chair to roll freely. Temporary override lever attached to the back of the wheelchair disengages the braking system when the wheelchair is unoccupied. No batteries needed. Available in two sizes: Standard or Wide (Bariatric).Standard fits 16"-20"W wheelchairs • Wide (Bariatric) fits 22"-24"W wheelchairsCaution: This device works only with sling-seat wheelchairs. The use of wooden solid-seat inserts and drop seats will interfere with the safe operation of this product. Periodic inspection is necessary to ensure proper adjustment.