A MPLS device which receives configuration data identifying a group of multi-labeled packets and desired EXP bits for the group when forwarding the related packets. A bioimpedance method and device that makes use of a refined model by which the conductivity contributions from intracellular tissues can be taken better into account to enable an improved assessment of the body composition of a patient with increased accuracy. Compared to the conventional arts which glue, one by one, a Radio Frequency Identification tag onto an electronic device, the manufacturing procedure is greatly simplified. The wheel gear assemblies transfer the driving force from the axle shafts to the wheel shafts, which are positioned at different vertical location relative to the axle shafts.