An oral care implement such as a toothbrush includes a head and a plurality of tooth cleaning elements supported by the toothbrush head. The direct conversion receiver device may include a blind IQ balance circuit configured to balance the I and Q signals without a pilot signal, and a mixer coupled to the blind IQ balance circuit and configured to generate I and Q baseband signals using an operational frequency, the operational frequency being based upon bandwidth and modulation of the I and Q signals. Bone fastener assemblies may be coupled to vertebrae. At a lower portion of the channel are a plurality of angled slots. In order to permit flexible adaptation to the variation in the screen size, the projector is constructed to permit easy adjustment of a detection device for detecting an image display position or a position indicated on the screen. The strip is removably attached to a connector and inserted into the aid through a narrow slot in the faceplate; the slot is bounded by the faceplate and by one of the edges of the battery door.