The invention relates to a process for the separation and recovery of non-ferrous metals from zinc-bearing residues, in particular from residues produced by the zinc manufacturing industry. In one embodiment, the method includes forming a first edge along a first cellular core panel section. The wave absorbing film is disposed on the circuit board module and is extended to overlap at least a part of the USB connector. The inside of the overhang is open. The touch sensitive pad may be a capacitive touchpad, a touch sensitive display screen, a conveyor belt or a push pad.