An emitter assembly for emitting a charged particle beam along an optical axis is described. Assemblies for connecting the club head and shaft may include: a cylindrical structure having a cylindrical interior chamber for receiving a golf club shaft, a rotation-inhibiting structure, and a securing structure; and a securing system for releasably engaging the securing structure. The glove design allows another, external layer purpose-engineered for particular applications to be either permanently or detachably attached on the exterior of the glove. The synchronizing signal output circuit is configured to output a synchronizing signal for lighting the light source.