A small PCB circute board detailed model with resistors and caasitors and everything, its a replica of a computer mouse internals, i have used this model personally in several project that requires PCB detail with just a little tweek, and that is one of the most advange of this model, you can use it basically anywhere you require to fill up an electrict device internal component, you can duplicate any component several times on the board because it is build to serve multiple purposes from the start