A mop head assembly for use with a handle and a cleaning substrate is disclosed. The second lens group includes a first lens subgroup on its object side having positive refractive power and at least one aspheric surface, and a second lens subgroup having positive refractive power. The clock data recovery circuit, coupled to the phase lock loop, locks an incoming data signal to generate a data recovery clock according to a second level control signal. In response to making this determination, the PMIP gateway may switch to serve the given WCD with the PMIP mode. Data from the sensors is collected, collated, processed and recorded to continuously provide a record of the handpiece characteristics for purposes of evaluating efficiency, quality control, safety and compliance with standards. Multi-layer articles and composite constructions, including retroreflective sheeting, fuel line hoses, and adhesive articles made of a fluoropolymer layer and a substantially non-fluorinated layer are also provided.