If you wanna use it for one of your own projects, go to Costumes in the sprite thing, right click, and click Export. It should show up in the Downloads section of your File Explorer. To import it into your project, download the mic, then click Upload Costume for whatever sprite you want to hold the mic, copy the mic sprite, and paste it in the costume(s) where you want it to go, and drag it where you want it to go, resize it to your liking, and done!
Don't forget, if you want to use this mic, give credit! (Sorry if it looks bad, this is my first time doing shading on a computer.)