You can get information about connected USB devices, and you can transfer data with the devices. The app detects if the USB device is supported as an input device by your system. You can bookmark info about devices. You can choose between different app themes.

Note: Sometimes the Android system omits some information about certain USB devices.

Features
• Get information about USB devices
• Make transfers with USB devices
• Bookmark information about USB devices
• 5 theme choices: Auto, Dark, Light, Black Out, and Light Amber
• Detect if the device is supported as an input device by your system
• Export data transfers as a text file

Try the Lite Version
https://play.google.com/store/apps/details?id=com.grantojanen.usbhostlite

More Details
Offline: Yes
Lightweight: Yes, < 1MB
Multi-Window Support: Yes
Descriptor: USB device communicator and info viewer (OTG)