Vortex Manipulator
The simple, wristwatch-esque design of a vortex manipulator makes time travel easy and portable. The vortex manipulator was issued to time agents in the 51st century and includes a leather strap to conceal the actual device and avoid drawing attention to oneself. Multiple people can be transported at once by holding on to the person wearing the vortex manipulator. Operation is also simple as one has only to enter the desired time and coordinates (however complicated it may be to distinguish these, which is not an error of the vortex manipulator but rather a consequence of the enormity of all of time and space). Vortex manipulators can burn out, but can be easily fixed with a sonic screwdriver. Of course, different models have different capabilities, but a top-of-the-line vortex manipulator is the best mode of time travel due to its simplicity and user-friendly operation.