Educational Insights Watch It Elapsed Time Homeschool Learning Tool The simplest, clearest way to teach elapsed time, this geared non-electronic set features two analog watches with correlating digital clocks underneath. Move the minute hand on the first watch to your desired start time and the minute hand on the second watch to your finish time—the digital clocks underneath automatically adjust! Then, slide open the cover on the answer window to see the elapsed time or keep it closed to quiz students. No batteries required! Approximate Measurements: 15"x12"x4.5" All offers considered Questions? Just Ask!