What is the purpose of the buttons on my hearing aids?

Edited

The buttons can be used to turn your hearing aids on/off and to adjust the volume of your hearing aids. 

To turn the hearing aids on; Press and hold the lower part of the rocker switch until the startup melody starts to play. Release the rocker switch while the melody is playing.

To turn the hearing aids off; Press and hold the lower part of the rocker switch for several seconds. A power down melody is played.

To adjust the volume of your hearing aids; press the upper part of the rocker switch to increase the volume or press the lower part to decrease the volume.