OTG Checker is a free utility tool developed by dzLab for Android 9.0 version. It helps users to check and verify their Android device system USB OTG capabilities without rooting their phone or tablet. This tool can quickly and effectively check if your device can support USB OTG, which means it can be used to connect to standard USB input devices such as keyboards, external storage, and more.

OTG Checker offers the following features:

• Check Device OS on USB OTG: Verify if your device operating system or custom ROM has the USB OTG API.
• Check USB OTG Signal: Check if your device has loaded with USB OTG driver or kernel to communicate with the USB OTG connected device.
• OTG Checker works without root permissions, so you don't need to root your device.

Starting from Android 4, applications can use the functions of USB host, but many devices have this functionality disabled. With OTG Checker, you can check if USB host functions are enabled on your Android-powered device.

Please note that the developer, dzLab, encourages users to email them with any questions and suggestions for improving the tool. Overall, OTG Checker is a useful utility tool for Android device users who want to verify their USB OTG capabilities.