Description The suite adopt a warning lamp circuit NE555 and CD4017 chip simulation to make blue LED and red LED flashing respectively according to the pulse adjusting RP1 flicker frequency can be adjusted Working circuit voltage of DC9 12 v suite does not contain the power battery The suite is easy to make obvious effect interesting suitable for electronic enthusiasts and vocational school students practical assembly Package included 1 x NE555 CD4017 Double color flashing lights kit