The Kandypens C-Box Pro is designed for 510 oil tanks. It utilizes magnetic adapters so you can just drop your tank in. The device stands at only 3 inches tall and is lightweight, despite its powerful 390 mAh battery. The C-Box Pro has four adjustable voltage settings up to 4.0 volts, charges via micro USB.
Specifications
Developed and designed in the USA
Warranty: Lifetime warranty
Charging current: Micro-USB charging port
510 threaded
Wattage: Variable voltage 2.3 V, 3.0 V, 3.6 V, 4.2 V
Battery capacity: 390 mAh battery
Magnetic threaded adapters
Designed and engineered for higher voltage requirement tanks