Locker: Playback Control Panel is an Android personalization app developed by Castbox.FM. It is a free app that enhances the playback control panel for Castbox, making it more practical and energy-saving.

With this app, you can control Castbox playback easily on one screen. It allows you to play/pause audio, adjust volume, fast forward 30s/rewind 10s, drag to adjust progress, play next/previous episode, switch play mode, adjust play speed, enable volume boost function, set sleep timer, enter settings, and use fingerprint unlock.

To use this theme, you need to download and install the app, install Castbox on your Android phone, go to Themes under Settings, open this theme, and apply it.

Overall, Locker: Playback Control Panel is a useful app for those who use Castbox frequently. It has a concise design and provides a range of practical functions for easy playback control.