The Saris Swing Away Hitch Adaptor is a hitch bike rack that is compatible with DUO Trays and DUO Add-ons. It has a 1-year manufacturer warranty and can be used for a lifetime. It is important to note that this hitch bike rack is not compatible with all hitch bike racks. Please consult your local bike shop to ensure compatibility. This hitch bike rack is also not recommended for use with electric bikes. If you have any questions, please feel free to contact us. Thank you for choosing Saris!