How loud is the Sway Audio Mag Boom?

It has a 3-watt full-range driver, so it is loud enough for a desk, tent or shower shelf but not for a room full of people. Expect it to distort if you push it to maximum.

How long does the battery last?

Sway rates it at about 4 hours of playback. That is short for a full day out, so plan to top it up over USB-C.

Can I pair two or more together?

Yes. The speaker supports multi-speaker pairing, and Sway says you can link all four units for surround sound. Each speaker still plays at 3 watts.

Does it work with a phone case on a metal surface?

The magnet is in the speaker, not the phone, so it sticks to metal regardless of your phone. It will not stick to glass, plastic or wood.

What comes in the box?

The listing shows the Mag Boom speaker in its box. A charging cable is not confirmed, so check before you buy if you need one.

It is the lowest of the two new prices tracked, at $13.00 at Poshmark as of November 5, 2026. At that price it is a low-risk buy for a small magnetic speaker.