See more info on Apple’s website: https://www.apple.com/homepod-mini/
Jam-packed with innovation, HomePod mini delivers unexpectedly big sound for a speaker of its size. At just 3.3 inches tall, it takes up almost no space but fills the entire room with rich 360‑degree audio that sounds amazing from every angle. Add more than one HomePod mini for truly expansive sound.
With multiple HomePod mini speakers placed around the house, you can have a connected sound system for your whole home. Ask Siri to play one song everywhere or, just as easily, a different song in each room.