Item Size: digital clock size: 6.6*3.3 * 0.8CMled screen :5x2.3CMProduct material: PP electronic componentsPacking: Color boxMain configuration: an LED screen digital clock (with wire),2 test cups (single), potato clock test metal strip (2 copper, 2 zinc, 9 long. 7CM), special transparent sticky tape, electric cable (21CM long)Packing size: 17*21.5 * 5.5CMProduct description:Simple and fast, the magic Test effect is presented immediately! Children are ecstatic, enlightened and innovative.Two potatoes, or two oranges, two tomatoes, and two apples, as long as they are any two fruits that you have reported the name, a supply can be produced. Even two glasses of water, two cups of cola and two cups of juice can be qualified for this job. They make you believe that everything is possible. Green science and education test series products have distinct significance of environmental protection, education and entertainment.The magic potato clock adopts direct material conversion power supply mode, and can use the digital clock without batteries and any other external power supply. You can operate this experiment like a scientist and experience the magic of the potato clock.