Ultimate Ears WONDERBOOM 2 Portable Wireless Bluetooth Speaker

Music at a hot tub has one hard rule: anything near the water runs on its own battery and is built to get wet. The WONDERBOOM 2 fits that rule – the maker rates it IP67 and says it floats – and at roughly 4 in (10 cm) tall it sits on a tub ledge or a step without taking over the space. The 13-hour battery and the buttons on the body mean the phone can stay inside.

It is an older model with a micro USB port, and this listing comes in one color. The Outdoor Boost button raises loudness for open air; for a quiet evening, the lower setting and a modest volume are the neighbor-friendly choice.

Tip: Start a long playlist before you get in and leave the phone indoors – the speaker’s own buttons handle the rest.