Competitor® 200805 37" Black Face Portable Pace Clock with Battery. Our 37" pace clock features large, highly visible 3-1/2" quarter numbers, designed primarily for competitive swim training. The 37" pace clock is equipped with a retractable stabilizing plate to protect against wind or accidental contact and no additional clock stand is necessary (the clock can also be wall mounted)! In addition to having wheels that allow for easy movability, the 37" clock has a storage space built into the back of the clock. The housings are offered only in white and the electrical option includes an 18-foot electrical cord with an on/off switch. The battery option includes a C-battery.