1# USB management 2 3### Introduction 4 5This example demonstrates the use of USB device management, including USB device insertion and removal status monitoring and USB device information display. The results are as follows: 6 7 8 9# Related Conceptions 10 111. [Subscribe to USB Listening Events](https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/reference/apis/js-apis-commonEvent.md#commoneventcreatesubscriber) : Obtain the interface usage status by subscribing to the USB insertion and removal listening events. 12 132. [Get USB Device List](https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/reference/apis/js-apis-usb.md#usbgetdevices): Gets the list of plugged in USB devices. 14 15### Related permissions 16 17Not involved 18 19### Usage 20 211. Open the **USB Listening** switch, and the interface pops up the prompt of "Start Listening...". 22 232. Plug in the device, the interface will have a "USB plugged in" prompt, the device list will show the plugged in device. If the list is not updated in time, you can manually refresh the drop-down list. 24 253. Click on the device, the pop-up box will display the specific information of the USB device, click the **OK** button to return to the main page. 26 274. Unplug the USB device, the interface will have a "removed device" prompt, and the device list will remove the device model. If the list is not updated in time, you can manually refresh the drop-down list. 28 29### Constraints and Restrictions 30 311. This sample is only supported to run on standard systems. 32 332. This sample requires DevEco Studio 3.0 Beta4 (Build Version: 3.0.0.992, built on July 14, 2022) to compile and run. 34
