The JUUL is one of the most popular "pod" style devices on the market. At $34.99 you get this very concealable device. The battery should last roughly a day depending on your usage. Charging is a breeze with the magnetic design. Liquids come in prefilled cartridges. These cost $14.99 for four of them and come in many different flavors. See the JUUL Pods tab under Liquid-Salts for a more in-depth description. The colors available are black and gold.