(Image credit: Apartment Therapy )

Ultimate Ears Boom
Ultimate Ears 

Designed for sharing music amongst friends in 360º with a water-resistant exterior, the Boom was designed to be used poolside and beyond. A rechargeable battery is good up to 15 hours (depending on how loud you like your music) and there's an interesting option to connect to 2 Bluetooth devices at the same time, allowing two people to share DJing duty, or the ability to connect to two Booms at once. Quite the social little bird, isn't it?