... phone,mp3.mp3, etc Specifications Portable size Built-in bluetooth RF wireless module Metal cabinet,rechargeable battery Support iPhone,ipod ... 4G, iPad, Droid (with latest operating platform) and other bluetooth devices *Inbuilt lithium battery with 3 hours working time*Aluminium ... Charger Time: 3 hours max9.Last Time: 4hours (via bluetooth to play)10.Driver Unit: 40mm, 4 Ohm ,3W11.Dimension:(L)55MM ...