A system for sensing the presence of nearby objects includes an emitter-detector assembly and retroreflector. The clamshell type portable wireless terminal having an upper housing and a lower housing connected to each other through a hinge has a projection section projecting outward near a hinge section of the lower housing. These approaches avoid the use of toxic excipients and or carriers commonly used to precipitate flavanolignan concentrates and thus address the drawbacks of existing methods and compositions.