The 510 Variable Voltage Twist Battery includes: -Twist Vape Pen Battery -500mAh/Variable Voltage/Preheat Function -0.5ml Capacity Vape Cartridge (refillable with ceramic heater) -USB Charger To properly charge the device, please use the below instructions: When connecting your device to a charger that came with your device for best results. If your charger needs to be connected to a USB source, DO NOT use the following charging methods or it may harm your battery or not charge it properly: laptops, rapid chargers, power banks, or Apple products. Standard Android, Blackberry, Amazon or generic wall adapters and desktop computers are good charging sources for the USB plugs.