A mobile device receives an indication of a user request to initiate a payment. One of the pair of case members includes a plurality of detents provided on an inner surface thereof. In manufacturing the energy absorber, a tool parting line of the manufacturing tool is defined such that the parting line defines at least two regions of the energy absorber displaying differing energy absorption characteristics. The device is moveable between a first state in which the telescopic elements are fully extended and a second state in which the telescopic elements are compressible against a bias inside the device to provide a resistance force to rotational movement about the elbow of a forearm in a direction towards an upper arm of the same arm of a user. The number of passes required through the pipeline to emulate M texture units is MN, rounded up to the next integer number of passes. The first extension section is set on a first side of the signal-feeding segment on the second plane of the substrate, and is utilized for increasing a bandwidth of the slot antenna.