Introduction - If you have any usage issues, please Google them yourself
1 powered, LED lights hit show, the volume reaches the loudest. (2) When you press the plus or minus keys to adjust the volume, the volume will be adjusted in the 1S volume. 3 When pressing the plus or minus button, LED indicator light flashes three under after writing this feature. 4 When the present times after power turned on, the volume will gradually return to the last saved volume.