The OSMALL uses a proprietary replacement cartridge system with 1.2 ohm atomizer resistance and 2ml juice capacity for your favorite E-Liquid or Salt Nicotine E-Liquids. The coil integrated within the pod is a round wire vertical coil, and flasks wicking. This design allows for smooth loose MTL draws with ample flavor. The replacement cartridges for the OSMALL also feature a side fill system that can be accessed through a silicone plug. The OSMALL also has an LED light built into it in order to indicate current battery power. Green light indicates 70% or more, blue means 30 to 70% and a red means that the device is below 30%. The Vaporesso OSMALL has a 350mAh battery and the life of the device will be perfect for day to day use. A mirco USB port is integrated on the polymer chassis and can charged at a rate of 1A, fully recharging the device in 45 minutes. Vaporesso is known for quality products and continue to produce amazing devices for a great price. Perfect for new users or casual users looking to spice up their pod system game.