EDI1807 Features: * Watch it! Elapsed time clock * Simplest, clearest way to teach elapsed time * Geared non-electronic set features two analog wristwatches with correlating digital clocks underneath * Digital clocks underneath automatically adjust * Slide open the cover on the answer window to see the elapsed time or keep it closed to quiz students * Patent pending Color/Finish: * Move the minute hand on the first watch to your desired start time and the second to your finish time