Small outdoor wireless mountable blutooth speaker recommendations?

A friend is setting up a home tiki bar in his backyard and wants mountable speakers for background music and sound effects (ocean sounds, etc.). He prefers to send music to his speakers via his iPhone and is not what I'd call an audiophile at all. And I was thinking he might need two sets of speakers: one for background music and one for sound effects.

I searched this forum but couldn't find any threads recommending speakers that might suit his needs and it's been a long time since I've ever looked at anything but HT speakers, etc. If anyone has any suggestions to offer, I'd appreciate hearing them. Thanks!