Most listings specify an IP67 rating — meaning the speaker is dustproof and can withstand temporary submersion (typically up to 1 m for 30 minutes) — and descriptions also note the speaker is floatable.
Yes. Listings highlight an Outdoor Boost mode or button that increases loudness and clarity to improve performance in outdoor environments.
Many listings describe a "double up" pairing feature that lets you connect two speakers to increase overall volume or enable true wireless stereo (separate left/right channels).
Descriptions mention on-speaker controls for play, pause and skip so you can control music directly from the speaker.
Listings describe the speaker as rugged for outdoor use: IP67 waterproof/dustproof/floatable protection, dirt resistance, a hanging loop for portability, and drop-tested protection (about a 5 ft / 1.5 m drop test in some listings).
Listings advertise 360-degree sound and boosted/full stereo audio with enhanced bass. Some specifications list maximum sound levels around 86–87 dBC and include driver/passive-radiator details for certain models.