An adjustable bottle stopper that stoppers a bottle by expanding a cylindrical elastic spacer within the neck of the bottle. The crown includes a front having a first height; a rear having a second height wherein the second height is greater than the first height; an interior including a forward portion; an exterior including a rearward portion; and a circumferential bottom edge separating the interior and exterior. The divider member is configured to maintain a different temperature in the first and second chambers. Additionally, the presence of integrated foam rubber protrusions within the mat structure provides an effective cushioning effect for pedestrian comfort as well as a means to prevent slippage of the article from its contacted surface. At the receiver side, the first andor second data streams can be reconstructed from a received signal. Since the write errors of the flash memory can be remedied, the service life of the semiconductor disk can be increased.