As a second model of its amplifier named EARTUBE MARK II - USB. In its amp, we have installed a very populare DIGITAL audio player for USB sticks or SD cards. Its player can handle memory size up to 8 GB and supported MP3 and WAV files.  An FM  reseiver is integrated too. You can direct select your music titles by panel buttons on front or with the remote control. Its nice to handle and simple to use and satisfight everyone who like to hear memorized digit music from sticks. 
 
 
 
Digital  Audio Player  - technicial describtions and possibilities:
*  Play music from any USB / sticks or SD - card up to 8 GB with MP3 or WAV format files  / FM radio integrated
*  Built in RTC clock cirucit with time /alarm function
*  MP3 / WAV decorder support 32–320kbps. 18-bit resolution with no missing codes, Dynamic range: 99 dB, sample rate: 48kHz
*  Play/Pause, Next ,Previous ,Vol- ,Vol+ ,Stop, EQ ,Repeat ,Mute
*  FAT16 or FAT32 systems supported
*  Memory the song number and volume even power cut down
*  With Remote control
*  Power supply optional (DC 3.7V / 5V)
*  Built in Amplifier Optional
*  LCD display
Keys function on Pannel
Power : Long press for stanby ,and lon g press again will wake up .
Set :    Setting for Time Alarm Sleep Language Finish
VOL- : Volume down and minus for setting Time , Alarm ,and Timing swith off.
VOL+:  Volume  down  and Plus  for  setting  Time ,  Alarm  ,and  Timing  swith off.
Play/Pause : Short press for Paly or Pause for USB and SD state (also for
auto-search channels and save them in FM state)
Remote Control Keys function
Power : ON/OFF    (standby )
Mode  :  Switch  order  will  be  USB SD FM USB  (if  have  USB memory and SD card) , Switch order will be USB FM USB (if only have USB memory) Switch order will be SD FM SD (if only have SD card )
PREV :Same functions as Previous Button on pannel
NEXT: Same functions as Next Button on pannel
VOL+ : Same functions as VOL+ Button on pannel
VOL-: Same functions as VOL- Button on pannel
REP:  For switching  one  song  repeat  or  all  song  repeat  in  USB/SD  state,
default is all song repeat .
*SET : Setting for Time Alarm Sleep Language Finish
MUTE: First press mute , press again will release from mute.
EQ : NORMAL, JAZZ, ROCK, POP, CLASSIC, COUNTRY
PLAY/PAUSE  : For play and pause in USB/SD state , for auto-search
channel and save them in FM state.
Button 0-9 : select song in USB/SD state, if the song number over 9 , just input the numbers in series.