A radio communication device includes a flat radiation element including a loop with a first end and a second end; a feed element including a coil pattern connected to the first end of the loop; and a radio IC element connected to the coil pattern. for performing a series of processing pieces by using plural functional blocks in response to any information signals, in which functions can be easily upgraded through version upgrading of the functional blocks. A coupling assembly can be used to assure that only tension or compression loads are applied. A wiper magnet is also disposed within the potentiometer housing. Heat spreaders can be interleaved between the stacked dies to enhance heat dissipation from the package. The skier can trigger the alarm by operating a switch on the remote activator.