Inheriting from OBS Engine RTA, the OBS Engine 2 is an innovative 5ml dual coils RTA tank with a patented top side filling system and precise 360 degree adjustable top airflow. This makes the Engine 2 RTA able to stop leakages effectively. The Engine 2 also comes with the precise air circulation system to concentrate the vapor and enhance the flavor. Together with the two posts build deck for easy dual coil building, the OBS Engine 2 RTA is definitely a great tank for you! Just get the Engine 2 to enjoy an amazing vape.