Deep. Loud. And immersive, too. The SoundLink Revolve II Bluetooth® speaker delivers true 360degree sound for consistent, uniform coverage. Place it in the center of the room to give everyone the same experience. Or set it near a wall so sound radiates and reflects. This wireless speaker is durable, water-resistant, and easy to grab and go – with a rechargeable battery that plays up to 13 hours. IP55 Waterproof Rating.