Bose SoundLink Revolve (Series II) Portable Bluetooth Speaker – Wireless Water-Resistant Speaker with 360° Sound, Black

Astonishingly loud. Surprisingly small — This small, portable wireless speaker is engineered to deliver true 360° sound for consistent, uniform coverage
Improved battery life — With up to 13 hours from a rechargeable lithium-ion battery, you get more play time than the original SoundLink Revolve speaker. Charging is easy via the Micro-B USB port
Durable portable speaker — SoundLink Revolve II is dust and water resistant (IP55 rating), so it will stand up to splashes by the pool.