Then looked at the exploded view and saw a tiny passive radiator

Great speaker with a passive radiator amazing

This speaker has a real passive radiator on the bottom that really moves hard, amazing how much real bass this micro speaker has, truly amazing!

The included case is important since the bottom "passive radiator" is actually soft -- maybe could be punctured

The included case is important since the bottom "passive radiator" is actually soft -- maybe could be punctured

It is solidly built, with a passive bass radiator on the bottom

This speaker has a real passive radiator on the bottom that really moves hard, amazing how much real bass this micro speaker has, truly amazing!

As others have said, it does have a small passive radiator in the bottom to give good bass

I'd like to add that due its downward passive radiator, the speaker will vibrate and if place on hard surface, e.g. table, and the volume is set to high, the speaker can fall off...this happened to me once

The sound from the echo dot is kind of flat and ambient sounds like rain, thunder, etc are not as clear as from other speakers

The sound from the echo dot is kind of flat and ambient sounds like rain, thunder, etc are not as clear as from other speakers

It's kind of heavy for its size (the other cheap-o feels 1/3 the weight)2

I bought another cheap-o brand on Amazon and the other one just does not match up to this little guy3) cute, has one button so not alot of stuff to have to think about4) pairs very easily to phone and both PC and Mac laptops5