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❥Advantage: This suite adopts simulation light circuit made with NE555 and CD4017,the blue LED and red LED flashed alternately according to the pulse. ❥Advantage: The multivibrator composed of NE555 will have a certain frequency of oscillation signal send to CD4017 decimal counter/pulse distributor,in order to count. ❥Advantage: .Change the RP1 size can change the oscillation period, thus changing the LED shining speed, the whole circuit DC9-12V can be worked. ❥Advantage: Ultra-fine production process, high quality assurance, fine parts. ❥Package include: 1Set