One class of nanorobotic systems usually consists of particles and an outside controller. The particle in itself is typically very simple, i.e. a tiny piece of a material, but one that can be controlled with light, magnetic fields or acoustic fields. For instance, a nanorobotic system may consist of sub-micron particles that possess a magnetic moment and a macroscopic laboratory setup with which magnetic fields controllably steer them. There might also be an imaging system to track the particles. Recent work has shown, for instance, that it is possible to control and move a swarm of cork-screw like magnetic nanopropellers through biological tissues. In this case the nanorobotic systems consists of the nanopropeller particles and the auxiliary equipment used to both actuate and track them. http://serious-science.org/nanorobots-in-medicine-9686?fbclid=IwAR3Hct1ySJcRs2QQ8y3yMd_uGaP7WRPgsDDiumZsjUKEmliDT3E2SNrJUeU