1. Power Systems: DC 7.5~15V power supply quiescent current is 50mA the maximum operating current of 2A. 2. Output Power: Dual stereo 10W x 10W (8 Ohm) 3. Playback: This unit supports USB SD card play songs MP3 WMV music format the red light is LED. When there is no inserted U disk SD card the indicator is always lidhted. When there is inserted USB disk SD card the indicator light will flash Indicates normal playback 4. Volume control: When the volume V + direction toward the toggle button the volume increases; When the volume buttons toggle toward the V-direction the volume decreases. 5. Audio Inputs: dual channel audio signal wire plugged into the machine's audio input jack; The other end into external tone output socket on the device (such as MP3. PCs. Phones etc.). When not plugged into an external audio signal the player is native songs. When you insert an external audio signal automatically disconnect the USB / SD Card. 6. Function keys: The machine has an SD card / USB Conversion button on the one. Suspended. the next one USB / SD converted EQ. 7. Remote controller support for audio input volume addition and subtraction. 8. Support tracks list turn off total power supply the next boot from the last played track starts playing. 9. Support 32~320KBPS rate supports large-capacity U disk SD card. 10. Supports PUSH-PUSH SD card pop-lengthened. 11. SD card up to 32GB