A surface maintenance apparatus is described, having a sweeping system positioned near the front or leading edge of the apparatus. Imaging of the subject using the first optical unit 100, or imaging of the subject using the second optical unit 200, can be selected. The write security unit outputs a first control signal to control whether a write operation is permissible, in response to a write signal, an address signal, and a write permission signal. A decorative trim strip having heat-formed corners extends within the trim strip receiving slots of the end members and the central member. Conductive surfaces of the cellular flip phone body are grounded at a single point that is near the antenna RF feed point. Likewise, some of the elements of a second Wheatstone bridge are provide on the first deflectable member and some are provided on the second.