@jklmd123 Thanks. I was wondering if there is a good portable one that can run off a battery (likely USB power brick). I have one, but it seems to be discontinued including the replacement filters.
@谢谢。我想知道是否有一个好的便携式电池可以运行（可能是USB电源砖）。我有一个，但它似乎已经停产，包括更换过滤器。