A distance measuring device is provided that reduces the time required for a distance measurement without degrading accuracy of the measured value. Novel catalysts for polymerizing alpha-olefin hydrocarbon monomers provide improved processes and products. Additionally, a game player will be equipped with a rubber ball or similar lightweight and resilient object that may be attached to the user’s hand via an elastic tether. The controller may be for switching between a normal message mode and an audio message mode based upon a connection between the headset output and a headset. Whereby, the slots will not be directly worn away by the metal pins so as to securely fasten the lens on the frame.