Variably controllable motion-damping devices are disclosed that utilize a magneto-rheological fluid. A plurality of disparate communication status signals with differing formats from a transceiver are combined in a logic module to create a single link quality indicator signal. Also disclosed are compositions for controlling an invertebrate pest comprising the compounds of Formula I. Housings are provided, secant to the radial cuts, damping inserts being positioned in said housings. The present invention further provides assays for the detection of NIPA-1 polymorphisms and mutations associated with disease states, as well as methods of screening for ligands and modulators of NIPA-1 proteins.