Vape Pen Blinking 3 times, 10 times and 20 times: Reasons and Fixes Select Vape Pen Batteries Instructions: How to Use MUVATEGLOBAL How to Charge a Disposable Vape: A Complete Guide How to Use & Charge a Vape Pen 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? Matej Barievi Facebook 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?