A heat sink is used to absorb heat produced by a vehicle. An expandable device such as a polymeric stent is mounted to an expansion member so as to prevent slippage of the polymeric stent relative to the expansion member during delivery while also exhibiting a low profile allowing for passage through the vasculature. In a second operation mode, the controller does not clear the data stored in the buffer even after the data in the buffer is transferred to the memory chip. The first, second, third, and fourth walls are formed at the four edges of the rectangular opening. The connector housing is provided with pairs of elastically deformable tabs, each of the pairs including two opposed deformable tabs and provided in each of the plurality of the terminal chambers.