Charging
1) Built-in battery in the watch can be charged either by USB or by A/C transformer.
2) When properly connected for charging, red light is on. When it turns to green, which means the battery is full and the charging process is completed.
3) If red light flashes in the music-playing mode indicates that the battery is low and the player will takes about 5 to 10 minutes to shut down automatically.
Re-charge is needed,

Light Indication
1) Red light on while charging. When completed, red light off and green light on.
2) Red light flashes when transmitting files; flash stops and red light on after the process is completed.
3) Green light blinks when playing music.
4) Press "REC" key when playing music. Then entering repeat playing mode and green light on.
5) In low battery mode, red light blinks. It takes 5 to 10 minutes for the music player to shut down automatically.
6) When the music player is being closed or is being connected to the computer,red light and green light will blink alternatively for seconds.
7) At the mode of stand by, the green light on which means to entering MP3 playing.The red light on means to entering record folder.
8) At the mode of stand by, Press "REW" key, red light blinks which means is recording.