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Adjust handsfree sound to the proper volume. Loud sound may damage you ears. For traffic safety, never use the headset while riding a bicycle or motorbike. While driving a car, it is dangerous to increase the sound volume too mush because you can not hear external sounds. Take great care about traffic around you.

+ Long press : the last song/is a platform

+ Short Press: turn up the volume

+ Switch, call can be connected when the call listen to music can cut song

+ Long press: next song/next radio station

+ Short press: lower the volume