A subscriber unit transmitter transmits signals over global and assigned channels to a base station which are initialized at an initial power level and adjusted to a controlled power level in advance of transmitting a communication data signal on an assigned channel to the base station. Each of the local processors is in communication with a respective acoustic pressure sensor. Each of the network sites is configured to sell a plurality of products, and at least one of the alternative shopping options comprises a purchase opportunity associated with a second one of the network sites. A punched hook engagement formed in this manner serves to easy consolidation of the closure such as the closure, a bearing or the like and the roller body into the motor-installed roller, in which they are protected from moving relative to each other in tangential and axial directions, also inhibiting the closure from slipping off even if subjected to vibration.