One of the most popular ones (PCB No. Y6), it has many flaws, just spray it lightly.
The principle is roughly: after pressing SW1 (note that SW1 is a self-reset button, not self-locking), VCC charges C2, discharges R1, and drives Q1 to conduct, NE555 starts to vibrate, and generates a signal to CD4017, which drives LED1-10 It emits light in sequence until C2 is discharged and the NE555 stops vibrating, producing a final result. 
The PCB silk screen labeling is incorrect. It should actually be "K" = 470KΩ.
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