Fusion has 6 volume levels. Tap the multi-function button once to move up one level.
A voice prompt tells you the level: "Volume one" through "Volume five", then "Max. Volume". After the highest level, the next tap cycles back to the lowest.
Have an older Fusion? Older Fusion models use tones instead of a voice prompt.
Need more help? Contact Ceretone Support at (866) 283-4262, support@ceretone.com, or visit the support center.