Designed for use in a wide variety of PA applications. Built-in MP3 recorder player with LCD display supplied with remote control and with built-in facility of USB, SD, MMC card & Bluetooth. ADP-30R has a Preamp output for connecting to Stereo or Mono input of another amplifier and a REC input for recording the preamp output of another amplifier. Provision for automatic changeover from AC to Battery Operation ensures continuity of program (if 12V battery is connected). Protection provided against the reverse polarity of battery connections.