6/12 channel commutator, the commutator adopts a microsensor + electric drive module inside, and is embedded with a fiber optic path, which can complete 6/12 channels + 1 optical path at the same time to prevent the entanglement of cables and optical fibers, and the driving torque is very low, even mice are still easy to rotate, suitable for experiments in the synchronous activity of electrophysiology and optogenetics for a long time.