The top cap is designed with cap tongue, which can slide into the tank groove perfectly, no leakage and easy to refill. The adjustable airflow system brings soft, stable and smooth vaping experience. It is optimized from Profile RDA deck, easy to build. Moreover, utilizes OFRF nexMesh coil to provide huger clouds and intense flavor. The Profile Unity RTA features deck-chamber linkage system that ensures steady incoming air and coil-focused air supply.