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

Input:
Question: What is the extra cutout on the left side of the device for? You said it serves a purpose. What purpose is it for?
Document: Received my Skinomi TechSkin fast! I had a temporary screen protector on my Mini until the Skinomi arrived. Make sure to follow prep instructions closely and everything will be just fine.The back protector fit is fantastic minus an extra cutout on the volume rocker side, but everything else for the back is great! There have been some complaints about the curved edges not sticking. When really damp, they won't.
If you don't make it wet enough, it is hard to adjust the cutout holes of the cover onto the right spots of your device and it will leave many bubbles. Don't give it heat by using heat gun or hair dryer at any circumstance as the installation guide video clip says. It could mess up the appearance of your protector. Just spray to make the corner pieces extra wet in order to get it sit well. Good luck.
I got the full skin and applied to the mini. Was very easy feels much better then zagg and BSE skins. Very smooth no orange peel effect. Only flaw I have is I believe there is a cutout on the right side of the device for a sim tray. I have the wifi version and it looks very out of place with a cutout there for no reason. Skinomi should offer a cellular version of the skin and one for wifi.
I must honestly say this product is not easy to apply. As a lot of people have said, it is messy when one has to wet the device. I applied to the screen and until now, the bubbles are still there. I gave up on applying the back side as it was difficult to line up the cutouts. Sorry to say I don't give this product a high thumbs up.
It was quite difficult to install. Left a lot of bubbles! It said they would clear but it did not.
The backside is a little bit trickier, but it was not as bad as some of the reviews made it out to be. Again, I sprayed more than i probably needed and did the flat surface first and did the edges and sides last. So once I got the backside perfect, I did one side at a time. Spraying extra solution before i started just to make sure it was wet enough to work with.
Once all of the solution evaporates and the ipad is dry the corners will stick very well. Take your time to align all of the cutouts for the various buttons, etc. and when it is done the skin all but disappears. One caution, use the spray sparingly and make sure there is enough left for the touch screen - I ran out and added water per the instructions on the box which said there would be enough reside in the bottle for several refills.
I'm sure in a few days they'll all be gone as they claim in the instructions.Quality:The cut of the full body protector is pretty good. There's an extra oval cut out on the volume button side that doesn't need to be there. The cut outs on the bottom near the speakers were a tiny bit off. It covered the speaker a tiny tiny bit. There was a little bit of roughness on the tiny piece that surrounded the power button...almost as if the cutter wasn't sharp enough.
The cover is durable and doesn't compromise the touch screen. I followed the instructions verbatim, but The spray that they said to use on the adhesive side of the screen protector made for difficult installation and there are several bubbles that I can't get out. The liquid also made the screen look hazy in the beginning, but it cleared up after about 24 hours. Overall, happy with the product.
If you register the product you can receive and extra screen protector.2. WarrantyCons1. Solution must sit for 4 to 5 hours or 12 hours at best to set.2. Wet solution on Electronic Device.3. Attracts Particles.4. Non-Reusable in my instance5. Process makes a mess to put on protector.
Answer: It's for the SIM card on the cellular models.