1.Control the rated volume which the mobile sent out. 2.Anti-radiation, retro, popular . 3.Compatible with iPhone . Specifications 1.Anti-radiation, retro, popular .2.Compatible with iPhone 3.Rubber paint,ABS,3.5M PU Cord 4.Sidekey Volume Control.answering/hanging up button5.Color:(Blue, Coral,Red, purple, yellow, pink, green, orange, black, whiter, pearly white) 1.Frequency:20-20000Hz 2. ...