Vandy Vape Pulse BF Squonk Box Mod is compatible with the 18650 and 20700 battery. With the build-in 8ml food grade silicone bottle, it is easy to refill. Meanwhile, the front panel and back panel of the Pulse BF mod can be replaced. The Vandy Vape Pulse BF Mod is the best squonk box to fit for your RDA. With the compact size, easy refill, more safe and good price, the Vandy Vape Pulse BF mod will be the good choice for you.