Portable sound is easy to carry around! Speaker comes with a self-storing jack cable that connects to most music players, mobile phones, computers, DVD players or any device with a standard stereo jack output. Built-in rechargeable lithium battery delivers 8 hours of play on a single charge. USB power cable included for charging when connected to any USB power supply. Features an ON/OFF power switch, volume control, mute button, magnetic shield speakers and a built-in digital amplifier.