... battery polarity. Cover the battery cover back. The red LED flicker once, it shows that the electronic system ... state, press "OPEN" button about 5 seconds. Red LED indicator flicker thrice, it shows the product is ... ,you can press "OPEN" button once again, LED indicator light about 3 seconds, it shows the ... use the product after 30 minutes.(6). Indicator(red LED): a. Open or close the rotary lamina, the ...