A rechargeable battery comprises an electrode assembly including a positive electrode, a negative electrode, and a separator that is interposed between the positive electrode and negative electrode. The dust controller includes a rotary protruding member fixed on the outer surface of the burr sleeve and rotating integrally with the burr sleeve, and a stationary protruding member attached to a stationary part of the handpiece and having a surface facing to the rotary protruding member to define a gap therebetween located outside of the lower ball bearing. The body portion is adapted for coupling with the hitch receiver to locate the base in a predetermined position thereon. Each reflecting bowl receives an emitting object therein. A controller module monitors the smoothing FIFO for each network link to insert or delete characters from each of the smoothing FIFO based on a sub-port configuration for maintaining an order in which information is received for the sub-port.