Volume Adjustment - Lock is a free utility and tool application developed by MyungLab for Android users. This app offers a useful volume control widget that allows users to adjust the sound of their device with ease. With a separate lock function for each volume, unintended sound changes can be prevented, providing users with a hassle-free experience.

One of the main features of this app is its ability to regulate various sound streams, including Ringtone, Media (music, video, games, and other media), Alarm, Voice Call, Notifications, and System Volume. The app also includes a volume lock and mute feature that can lock each volume stream and ringer mode, preventing any unnecessary sound changes. Additionally, users can check the sound lock function directly from the top status bar. The app also offers a sound mode feature that allows users to change the ringer mode to Normal, Silent, or Vibrate.

Overall, Volume Adjustment - Lock is a very useful app for those who seek a convenient and easy-to-use volume control widget for their Android device. Users can also change the device's ringtone, notifications, and alarm sounds through the app's settings.