The polyester-based resin composition of the present invention comprises a polyamide resin, a polyester resin containing an antimony compound and a compound selected from the group consisting of inorganic acid salts and hydroxides of group-1 or -2 metals of the periodic table and transition metals. The fuel vent valve also prevents fuel from spilling out from filler neck during filling of a fuel tank. A wireless communications circuit is carried by a circuit board. Upon deactivation of the motor, the motor brake, which is also engaged with the shaft, operates to prevent any further rotation of the shaft to maintain the mobile storage unit in a specified location regardless of deflection of the surface on which the storage unit is positioned. In one more embodiments, a computer implemented method provides for billing invoices in response to one or more of a customer’s network elements which have been correlated with detailed network data, classified into one or more billing event categories, and rated in accordance with a predetermined hierarchy.