Combines The Features Of A Rollator And Transport Chair Into One Unit. The User Can Ambulate Independently Or Be Pushed Safely By A Caregiver. * The Tool-free Two-position Contoured Backrest Is Reversible Depending On Whether You Are Using The Nitro Duet As A Rollator Or Transport Chair. * Back Support Height Easily Adjusts With Tool-free Buttons. * Caster Fork Design And Large 10 Front Casters Enhances Turning Radius And Rolling Comfort. * Cross-brace Design Allows For Side-to-side Folding And Added Stability. * Brake Cables Routed Inside The Frame Add Safety And Convenience.