Highlights 1) MMC/SD card available, automatically search for signal 2)100% new raw materials 3)strictly selected transformer: resisting 160 °c 4)360° knob volumn control 5)100% copper connect wire 6)20 private moulds for product dept. 7)2 speaker factories, 1 plastic factory for panel production 8)20 year experience in manufacturing & export, steady clients 9)sound manage system, responsible staff at your service