Select | 510 Batteries | Secret Bar

Select Secret Bar 650mAh: stores more charge and more power How to Use: Power On/Off: Press the top button 5 times. Voltage Settings: Press 3 times to cycle through: Red (3.8V), Blue (3.4V), Green (2.8V). Preheat Mode: Press 2 times Charging: Type-C port (bottom); LED turns on when charging and stops when fully charged.