Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: the product changes the stations and volume and turns the radio only off not the docking unit itself. I have a xm expressIs that normal?
Document: All controls are not operable for the onyx unit when combined with the radio base. from Sirius xm  radio base.
Works perfect!!!! I have the xm radio in my car and this worked quick and easy!! It makes using it in your car safer and easier!
Got the new SiriusXM  Onyx Plus Vehicle Unit for Xmas, did not come with remote (HOME Unit Only). This remote worked flawlessly with the unit. Be sure to first press the a/b button for direct tune on the unit first, then enter a channel number, once that is done all is well. So nice to be able to change the channel, use the menu, power off and on, and set preset stations.Was delivered fast and on time.
I bought this remote for less than $10 and I feel that was probably the upper limit of it's value. It arrived DOA so I had to go buy a new battery for it. After installing the new battery, it immediately synced with my XM Onyx radio in the car. It works well enough to change channels and scroll through stations.
This is not a universal remote. It will only change channels,  not turn system on or off,  and when you use volume control the channels move up and down not the volume.When I e-mailed the company the phone number they sent me was a fax # so I was not able to talk to anyone.
Does everything but turn up volume....great little remote for my XM onyx
Just as other reviewers stated - I ordered it to use with my Onyx and it worked perfectly right out of the box! Just pull the little tab for the batteries and you're ready to go; no programming whatsoever. Fantastic product and I would highly recommend it.
This can be used on your Sirius Onyx Plus. I was a lil hesitant because I wasn't sure it would work with the Sirius Onyx Plus (but it did) it was a good price and being a prime member it was here really quick. The remote has  xm branding on but who cares as long as it works....right?
I was a little apprehensive about buying a generic remote for my XM Onyx receiver, but I have to admit, this works perfectly right out of the box. Battery included. I threw it in the car and started using it immediately - no setup required. I would highly recommend this product as it is a great convenience to have in the car (or home).
This was the same exact remote control that came with my BB1XM boombox that I bought a few years ago! It didn't require any programming and operates all functions of the radio perfectly!
Answer: That is what it does.  It was sold to me as a universal remote,  but it does not do anything but change channels, turn the radio on , not the dock.Will not change volume.