Banana Boat Waterproof Speaker Case Banana Boat Waterproof Speaker Case Take your music on the go! Built with a rugged protective body that will keep your expensive phone or music device safe and dry while you still enjoy your favorite tunes even in the harshest of environments! The spacious body has room for most phones, music players, keys, credit cards, driver's license, and cash! The use of a 1/8" headphone jack allows the case to be used universally with most phones and music devices with a headphone port. Simply install 3 AA batteries, plug the speaker jack into the device's head phone port, secure the device in the case with your other valuables. This protects the speaker from damage in the event the case is subject to a high-pressure shift, such as in aircraft or high altitude climbing. Requires 3AA batteries, not included.