The iJoy Captain S Sub-Ohm Tank is the improved rendition of the popular Captain series, retaining the specially designed grooved base section and un-threaded coil head while implementing minor changes with a new sliding retractable top-fill design. The Captain S Tank is creatively designed with a grooved section located below the juice reservoir and right above the coil chamber. This result in a reduction in heat transmission route and helps prevent the entire structure from heating up during extended use. The tank capacity is 4 milliliter, exposed via a brand-new retractable sliding top-fill design. The thread-less coil system returns from iJoy, in which coil replacements are made in a convenient manner, simply open the structure and pop open the coil head. The included 0.3ohm CA2 Dual Coil Head has an output range of 60 to 80W, with an introduction of the 0.25ohm CA3 Triple Coil Head rated for 60 to 100W.