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"Educators Resource offers products for preK-8 learning materials and educational toys used by schools teachers parents and children. The simplest clearest way to teach elapsed time this geared non-electronic set features two analog wristwatches with correlating digital clocks underneath. Move the minute hand on the first watch to your desired start time and the second 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. Patent pending.Ages 6+/Grades 1+Features & Benefits:- Includes two giant analog geared wristwatches; two correlating digital clocks; elapsed time answer window with sliding quiz cover and teacher guide with multilingual instructions (English Spanish French and German)- No batteries required!- A clear and simple way to teach and quiz elapsed time - Provides reading analog clocks and adding time practice"