How does Motorola v998 quickly switch between mute and ringtone?

The specific operation method is as follows:

1, press and hold the volume key-until the device vibrates. At this time, the phone is in vibration mode. Click the "Mute" switch in the pop-up volume adjustment interface, the phone will be in mute mode, and the mute time can be set.

2. Slide the shortcut bar at the bottom up and light it in the shortcut menu.