The Stannah 300/400 IR Upgrade Wall Controls and Hinge & Carrage System are electronic controller components specifically designed for Stannah 300/400 models. These parts and accessories enhance the functionality of Stannah stairlifts, providing users with increased mobility and safety in their homes. The upgrade includes wall controls for easy operation and a hinge and carriage system for smooth mobility. Perfect for individuals looking to maintain their independence and quality of life, these electronic components are a reliable and essential addition to any Stannah stairlift installation. And have been removed from a working unit new 3 AA batteries required for remotes