The invention provides an assembled product, comprising a main body, and a left part and right part which are of the same construction and symmetrically mounted to the main body. The present invention encompasses a refined calculus and methodology for deriving the link adaptation thresholds in a retransmission environment using a complex model and analysis of the retransmission environment. Particularly desirable is a nanoparticle comprising a Pt3Co@PtC structurally ordered core-shell composition supported upon a carbon support. The device includes a test current generator to supply a test current to one of the data lines, a voltage detector to detect the voltage of one of the data lines, and a controller to control switches, the test current generator and the voltage detector.