a ring counter provides signals to transistors that sequentially drive the leds excitation provided to the ring counter is controlled to cause a desired current through the leds to simulate a rotating beacon a flashing beacon or a continuous light application_number US 10738905 A description as shown in fig1 and 2 a hazard marker 10 has a general shape of a disc the marker 10 includes a lower housing 12 and an upper housing 14 that are made from a high impact plastic the upper housing 14 is transparent a bolt 16 passes through the lower housing 12 and screws into the upper housing whereby the lower housing 12 and the upper housing 14 are held together the transparent upper housing 14 has a depending circular wall 11 shown in fig1 with a diameter slightly smaller than the upstanding wall 13 of the lower housing 12 this double walled construction allows the hazard marker to be sealed against leakage also a circumferential ring seal 15 supported by the upstanding wall 13 contacts upper housing 14 so that when the upper housing and the lower housing are bolted together they form a watertight joint visible through the upper housing 14 is circular board 19 shown in fig2 whereon leds 20 a through 20 j are circularly disposed as explained hereinafter the leds 20 a through 20 j transmit.