E-juice vaporizers are designed to vaporize e-liquid discreetly and effectively. Units like the these are portable and compact, ideal for vaping on-the-go. Most vape pens for e-juice utilise a lithium-ion battery as their power source, as well as a tank (clearomizer), which holds e-liquid. Contained within the tank is the heat source, known as the atomizer. E-juice atomizers typically utilise wicks. These wicks absorb the liquid in the tank, which is then heated by the press of a button. These units are user-friendly and very simple to operate.