How does the disposable vape ban work, and how harmful is vaping? There is a tiny component inside disposable vapes that people mistakenly assume is a microphone. It is not. It is a special sensor that causes the heating element to produce vapor when triggered. ### Disposable vape, just three components but what it bugs me how does it know when it's empty. Led flashes when no juice is left but how? What makes led flash? Off Stamp X Cube Crystal 35K Disposable Kit 17mL & 35,000 Puffs Giant Vapes