Vibrator help

So I got a vibrator from Spencer’s (I know they’re cheap but I’m not looking for anything too special just to get me off) and I literally can’t figure out how to use it

It’s RO9mm, and it’s supposed to be 10 speed but I don’t know how to change the speed. Has anyone had this before and can help me? I’m just tryna get off lol

Update it’s probably faulty because I used it on the one speed and it got really hot. I did cum though so I guess it did what it was supposed to