Sound Mobile Outdoor Speaker. Sound Mobile - an outdoor speaker powered by the sun. USB power also possible for indoor use. This is a Bluetooth device which pairs with your Smartphone or PC or device with Bluetooth. There is a phone interrupt which pauses the music during an incoming call. Water resistant and ideal for use in the outdoors, by a pool or on the beach. Standard use inside with USB charge. Battery life is 8 hours. Dimensions: 8" Diameter x 8" Height