A lever assembly includes a lever and a fastener for pivotally mounting the lever to a fixed support member. The processor estimates a new crystal coefficient value based on a comparison of the frequency of the output of the frequency synthesizer against a target output frequency in relation to a crystal temperature value. When the wireless communication device returns from the transition, the supervision timers are used to estimate the duration of the transition. The emission of fluorescence radiation from such fluorophores in response to the excitation can be detected and analyzed to obtain information regarding a cell type of interest. In some embodiments, the bass shaker system includes ventilated caps and vented housing covers. The property may be angle and wavelength dependent and may include the intensity of TM- and TE-polarized radiation and their relative phase difference.