Wooshh has 4 volume levels and you can scroll through them by holding the button down (long press).
Release the button when you are on the desired volume level. It can be best to use a constant sound like the rain sound for setting the volume, so you hear each change most clearly.
Once set the volume level will be remembered until you next re-charge the device.
After charging it will be set to the lowest level.
Whenever possible we recommend using the lowest volume setting to increase battery life.
