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•Playback/pause button: Short pressing in Micro SD card, USB disk or audio
input results in pausing or playing the track. In FM radio mode, short pressing the
button will start searching for a radio station, and once the search is completed,
it will automatically save all of the found stations and jumps to the first station
playing.
•Next/fast forward button: When the device is in a Micro SD card/USB disk
mode, short pressing the button will result in next song being played, long
pressing will fast forward the current track. When the device is in an FM mode,
short pressing will start searching for frequencies above the current frequency,
while long pressing will jump to the next radio station. Finally, when in an audio
input mode, long pressing will turn the volume up.
•AB repeat/cycle button: When playing an MP3 track, pressing the button will
remember a point in the track, and pressing the button again will remember the
finishing point of your selection. From this point on, the speaker will be playing
only the track bordered by your selection. Short pressing the button will cancer
the repeat function. Long pressing switches between single cycle and all cycles.
•Switch/volume knob: Turn the knob clockwise to power on the device. When
powered on, turning the knob clockwise will increase the volume. Turning the
knob counter-clockwise will decrease the volume, and turning the knob all the
way to the left will turn off the device.
•AUX input port: Using the 3.5mm universal audio cable, you can connect the
device to computers, mobile phones, music players, and so on.
•Digital display: Displays the playback status, playback time, FM frequency and
other information.
•Microphone jack: Insert a professional 43dB wired microphone with 3.5mm
plug, then begin the voice amplification.
•USB disk port: Plug a USB disk with MP3 format music files after turning on the
amplifier, then it can automatically play the music out of the USB disk.
•Antenna: When listening to FM radio programs, be sure to pull the antenna out
completely.
•Micro SD card: Plug a Micro SD card with MP3 format music files after turning on
the amplifier, then it can automatically play the music out of the Micro SD card.
•DC 4V charging port: Connect the charging interface using a standard DC 5V
charger for charging.