Easy & Convenient to use: Rove carts are great for novices. These are really easy to use , charge and refill with new pods. To cycle amongst reduced & large voltage disconnect and reconnect the cartridge three times. A blue light-weight = very low voltage method = colder atomizer temperature. https://www.cityfos.com/company/Rove-Carts-in-Lynwood-CA-23023876.htm