MK Explorer is another simple file manager.

Features and functions:
✓ Material Design
✓ Of course: delete, copy, paste, and move
✓ Two windows (panels) to view files
✓ Shortcuts on the desktop directly from the main application
✓ Keyboard Shortcuts
✓ Search engine for files
✓ Thumbnails of images, videos and APK files
✓ Extracting ZIP and RAR archives
✓ Compression to ZIP
✓ Root access
✓ Lollipop SD Card support
✓ Adapted to smartphones, tablets 7 and 10 inch
✓ Built-in gallery
✓ Built-in text editor
✓ Built-in music player
✓ Supports 20 languages

Permissions:
✓ WRITE_EXTERNAL_STORAGE - need to write files
✓ READ_EXTERNAL_STORAGE - need to read files
✓ INSTALL_SHORTCUT - need to add shortcut to desktop
✓ ACCESS_SUPERUSER - need to get access to root
✓ WAKE_LOCK - need to properly perform operations on files when the screen is off
✓ WRITE_SETTINGS - need to set audio files as a ringtone