Methods and apparatus for wireless communication include monitoring, by a user equipment, a signal quality value from at least one of a serving cell or a target cell. An air space is located between the base of the head and the membrane so that the membrane is capable of flexing to alter its original shape during use of the toothbrush and then recover to the original shape randomly during use. A contact surface is provided on the tool disk and can be clamped to an accommodating surface on the accommodating disk by a clamping device. The multi-tasking power processor is further configurable as a motor drive between the motor interface and the high voltage direct current bus interface.