Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Where do the batteries go on this remote? I just received mine, still waiting for my E420i-A0 TV to arrive!
Document: I bought mine for model # E420i-A0, works just fine. Pop in some batteries--not included--and move on with your life. As others have said, it would be great if Vizio included these with all smart TVs right out of the box, but at least they don't gouge you on price after the fact.
I purchased this remote at the same time as a VIZIO E420i-A0 42-Inch 1080p 120Hz Smart LED HDTV. Like many others, I find the Vizio TV to be excellent, however, the Smart TV function is literally useless. After wrestling with it for a week, I finally purchased a Roku for connecting the net to my TV.That's what needs to be understood about this remote. It's completely unnecessary, and will not work for your Roku, Google Chromecast, or other online video interface.
Awesome! It worked without needing to be programmed. My tv didn't come with the remote with a qwerty keyboard so I ordered this. Works perfect and looks just like the stock remote that came with my VIZIO E420i-A0 smart tv 42 inch.
I had to purchase this remote as I purchased my TV used. It was hard to figure out the batteries but other than that it was worth having if for the smart Tv.
I ordered it because the remote I got from my TV purchase did not have a keyboard. The normal side works just fine, but the Qwerty keyboard side is still a little difficult for large fingers to operate, and some of the keys are hard to push. Maybe with use it will get better to the touch. Will have to wait and see.
It is a great addition to the original remote received with the TV. They do not interfere with each other. And it is easier to type entries on the screen than using the screen based key board.
Received This remote very fast and am very happy with how it works. I didn't have to even program it into  my tv It worked right out of the box.
The remote is actually a marketing up-sell by Vizio and should have been included in the purchase of the TV anyways.Besides the remote only being useful if you're using the Vizio Smart TV function, it's also a cheap junky item. The keyboard on the back feels unnatural in your hand. The dot-com button is already coming loose on mine and I've only used it maybe five times. Think about how a typical remote feels in your hand.
Thought I'd note that I have the E420I-A0 and the remote worked perfectly, even the qwerty keypad--that had been my concern, as the tv didn't come with a qwerty-remote. So, if you have my model, it works. And likely will with similar models that didn't have an original qwerty remote.It does not work with my cable box, so searching its listings--no help.The face of the remote is identical to the original, only change is the back keypad.
I love my new VIZIO - E-Series - 42&#34; Class (42&#34; Diag.) - LED - 1080p - 120Hz - Smart - 3D - HDTV Model: E420d-A0 before the remote, but love it even more now that I have this remote. At first I was a tiny bit concerned that this remote wouldn't work with it, but it did and I'm happy. If you have the Vizio E420d-A0, buy this and you will be happy.
Answer: The front bottom part if the remote slides off