... device has polycrystalline silicon solar panel4.Direct voice to microphone contact for best sound clarity 5.Bluetooth transmission distance ... ,English,French, German, Spanish, Russian,Chinese,ItalianSpecification Bluetooth Version 2.0+EDRMusic format MP3Noise ratio >90dBFM ... FM transmiter,speaker and polycrystalline silicon solar panel ;support TF card USB +LCD screen, Bluetooth Car Mp3 player