Hamburger Speaker 1.Fashion design 2.Accompanying speaker for MP3,MP4,MP5 and ... Speaker, Mini Speaker for mobilephone with li-battery Product Feature:1.ABS+PU paint spray.2.Patented expansile resonator will increase ... will be smaller to be kept in pocket. 3.With 3.5mm audio plug, Applicable to many digital ... .5.Built-in li-battery, longer time for playing with 2~3 hours.6.Approval: RoHS, CE, FCC etc ...