New tungsten carbides alloyed with fluorine in amounts up to 0. The system has a first receiver, a second receiver, and an input device configured to transmit a command signal in response to user input. The protective case includes a housing for storing the tablet PC, and a button portion corresponding to the position of the button on the tablet PC. The second connection configuration includes a different connection configuration than the first receiver thereby providing an adaptive connection function between the alarm device and the wire harness. Preferably, the center cushion partially surrounds a centrally located pocket.