USB OTG Checker let you to check,

• Check Device OS on USB OTG: Your device operating system or custom ROM has the USB OTG API?
• Check USB OTG Signal: Your device has load with USB OTG driver or kernel to communicate to the USB OTG Connected device?
• Browse USB OTG Storage: Can you access ( View ) the USB OTG connected External Storage Folder?

** For Advanced Features and Test on USB OTG compatibility, you can refer to USB OTG Checker Pro Version.
*** Feel free to email me any questions and give me suggestion about this tools. I will try to improve the USB OTG Checker tool and fix any bug! Thanks!!