Suitable materials for use as the housing 200 include, for example, polyethylene, such as high density polyethylene and low density polyethylene; ethylene copolymers with other olefins, such as linear low density polyethylene or ultra low density polyethylene; polypropylene; polypropylene copolymers with other olefins; polycarbonate ; polymethylmethacrylate ; polyamides; styrene-acrylonitrile (SAN