LEVEL UP with NERDS Dual Chamber Experience the cool blast of Icy Blue Raspberry, the tangy zest of Orange Crush, or mix them both for a flavor explosion that doubles your How to Use an All In One Disposable Vape? iKrusher Cannabis Vapes DiscoFSH Cannabis 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?