Generic Electric egg boiler to boil 7 eggs at once

i received this product not in orignal condition, it looks like very old or used product, no orignal carton, also, there is no manual so that i can study how to use it, i pour water and water fell down slowly once boiling, also dont know when to switch off or automatically it will off the plastic cap dont jave any lock it spits the steam water outside which maybe dangerous as its electric...