Ivation Multi-Function Bicycle Speaker With External Audio Controls -Black - Portable Travel Speaker Case, For all iPhones, iPods, Phones, Android Devices and MP3 Players - With USB and SD Card Player - 1000mAh Rechargeable battery This Speaker Has Exceptional Clarity of Sound and a Built-in Amplifier for a Surprisingly Loud Volume Connect any MP3 player or phone VIA the 3.5mm AUX cable Also has a built in USB reader that allows you to play / pause / forward / reverse audio from any USB device Includes a 1000mAh Rechargeable Li-ion Battery for up to 15 hours of continues play Sturdy case stores your Sunglasses, phone or MP3 Device and protects it from shock and weather