My current one doesn't have them, but the last one did. Couldn't use one side, the headphone jack wouldn't go in properly, however hard I pushed. I use the Disco for carrying wheat to feed pheasants and I eventually found a couple of grains of wheat in the socket. By the time I pulled them out, it was a miniature perfectly formed loaf of bread.
Not all of the above is true.
And none of it is relevant. I just had to tell you.