The left side (when facing the screen toward the) There is a button on/off ringtones. Designed to be hit by moving left/right to work quickly next to the Add button, the volume, and volume buttons.
The left (when facing the screen towards you) is the on / off ringing. Designed to press the left / right. Easy to use Next to the button, volume up and volume down buttons.
On the left (when facing the screen toward). The on / off ringtones. Designed to be pressed by moving the left / right to work quickly. The next are the keys to increase the level of the sound button and decrease the volume.