The Big Turtle Shell Rugged Water-Resistant Wireless Bluetooth Hi-Fi Speaker by Outdoor Tech, is a portable Bluetooth speaker with huge sound and functionality. It’s massive sound can fill any room, or outside space while its lithium-ion battery doubles as a power bank for your other mobile devices. The Big Turtle Shell gives you the best wireless audio experience in any setting, from the beach to the pool party, from the campfire to the backyard BBQ, and, it does it with style and ease.