Horizon Aquila Tank is designed with a plug-in-out changing method at the bottom base, which greatly simplifies coil replacement. It has Pre-installed Coil: E1 Dual Mesh Coil 0.16ohm (60-70W). Top filling, one-click spring-loaded button, and filling the e juice from the top provide a 5ml e liquid capacity. Bottom airflow control ring with dual slots and mesh coil compatibility. The Updraft Rising Airflow design is a perfect match for the E1 & P1 Coil structures, with the goal of maximizing the smoothness sensation through vertical-ventilation updraft to intensify cloud density and essence extraction.