Systems and methods produce imagery on a display in response inputs received from a directional input device, wherein the inputs correspond to directional instructions provided by a user. An opening is defined on at least one of the pair of handles or the resilient element. The time recording device also includes a unit for recording a time which has elapsed since charge injection on the basis of changes in the transmission behavior of the channel region caused by a shift in the center of concentration of the charges in the nitride layer away from the interface. The wavelength is preferably in the range of 440 to 560 nm. In addition, a second conversion material may at least partially cover the first andor second LED chips, and may be configured to absorb at least some of the light of the first andor second colors and re-emit light of a fourth color.