Underground Toys Doctor Who TARDIS Key Chain. One Size. Color: Blue. Looks just like the Doctor's TARDIS in the show. Base comes out to insert your money. Who's Time Machine TARDIS in all its glory. Travel with the TARDIS every time. This keychain features Dr. Keep TARDIS close to you at all times with this officially licensed keychain! Manufacturer Minimun Age: 24 months. Warranty period: 1 year warranty against manufacturer defects. Item dimensions: width: 100, height: 744.