Sony ULT Field 3 Wireless Portable Bluetooth Speaker, IP67 Waterproof, Dustproof, Rustproof, and Shockproof with Enhanced Bass,

Powerful bass from a portable speaker. The ULT FIELD 3 is designed to be carried in one hand and comes with a stowable shoulder strap to make it easy to transport. Its also waterproof and dustproof, so that you can take your favorite music to the beach and beyond.