Vandy Vape Pulse BF mod comes with intelligent fire button and locking power safety switch. It makes the mod safer. Copper contacts, no wires, direct connect from switch to 510 for max conductivity. Two access points on the back for easy removal of battery and bottle. And this mod comes with special design that put a 8ml large capacity e-juice bottle inside the mod. The colorful panels also can be replaceable. Pulse 24 BF RDA (special edition) features 24.4mm diameter and also comes with unique leak resistant tubular side direct airflow. It can hold 2.0ml liquid capacity and bottom feed directly to side juice wells. It is very easy to build with 4 spare philips screws.