... *Built-in rechargeable battery or USB power supply *With colorful LED light flashing when music on*Built in Lithium battery playback ... 4-5 hours*LED display*Adapt to different kinds of device, such as mp3, mp4, CD, radio, mobile phone, computer*Popular and ... 78*83*88mm Color Blue,RED Control Provided Volume, Power, LED Audio output earphone Specifications Card typeTF/USB Speaker output 5W ...