Timo Corbett I, TM-BT003-2015A-BU, Rugged and Waterproof Wireless Bluetooth Speaker (Blue) Wireless Bluetooth audio experience, connects to most bluetooth compatible devices Extremely rugged design and true waterproof feature with IPX7 standard Internal rechargeable Lithium Ion battery gives 10+ hours playing time with 80% volume Portable with integrated professional carabiner for carrying and mounting Versatile with AUX, MicroSD Card Slot, NFC, integrated microphone and hand free phone call