Kiefer Pace Clocks are fabricated using a sturdy, molded polyethylene body with a high contrast face with red and black markings and large hands that allow for optimum visibility for swimmers at your pool. The minute hand can be easily repositioned through a rear access panel. A C-size batter motor with a 110V power adapter allows use with either the battery or powered through a standard 110V outlet. Includes a wall mount bracket. The clock's 36" face has the best available visibility and complies with USA Swimming's Technical Facilities Standards Rule 103.16 for viewable clock face size requirement.