What is the fine-grained topic of the following text: The Bunker has been designed with two viewing windows in the top cap, as this RDA can be used on a squonk box, this will allow you to keep an eye on your cotton drying out without having to squint down the drip tip or remove the cap! Only return the topic.
Design features of the Bunker RDA (Rebuildable Dripping Atomizer)