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

Input:
Question: What battery # does this use for replacements?  It would be nice if it used the same ones as my other IR camera remotes.
Document: May be the only complain was about the battery, the orignal had a short live I changed for a new ones and I had not changed for a while. A cheap product that fulfills it's goal. I used it often.
Also nice for tripod-mounted long exposures, because pushing the regular shutter button can sometimes jiggle the camera. Use this, and your camera stays rock-steady.A word of advice: Not all NEX cameras will work with wireless remotes, like the new NEX-3N, so check your owner's manual before ordering.
Excellent value and nice and simple. Yes, the instruction sheet is sparse, no info on how to change the battery, but at this price it might be cheaper to buy extra remotes for back up than to buy more batteries (and I am going to buy at least one extra, it's quite small and I can see myself losing it). I wasn't sure what 'quick response' mode was either, it's just 'remote control' drive mode. Autofocus seems to work great also.
This remote is compact and lightweight and I highly recommend it. I use it with my Sony NEX-6 and A65V. One button is used to trigger a picture immediately and with the 2nd button you get a 2s delay before the shutter is triggered. That is a nice feature because both cameras have only a 10s internal shutter delay selectable.After pushing the button you 1st get a focus confirmation from the camera with a beep (if enabled and in AF mode) and just a bit later the shutter is triggered.
In comparison the other remote which I use quite a few times a month had plenty of battery power and to this day is still going on the original battery. The battery in the remote is a standard watch battery that's easy to find at any store.TIP:  You can find out if your remote is working using a cell phone camera. Open the app and aim the IR transmitter end at your cell phone so you can see it in the shot.
The other complaint is that I have to stand very close and almost in front of the camera. Would be nice if I could stand behind and use the control. I bought this controller to use in bulb setting since I'm getting into night photography. I think the product will do until I get a better camera.
This is the first remote I have used for a camera. When I bought my Sony a65, I was told a remote would be about $30. This was such a low price I was sure it wouldn't work, but it does! Everyone should have this remote to use!
I have only had use it a couple of time, but it work good everything I have used it. It come with a battery and it easy to set up with my Sony camera.
It shipped to me with a dead battery and it would've cost me more to mail it back because i used a gift card. I'm disappointed. Not even sure if it works. I would not recommend this.
This remote works well, has a good range and it far cheaper than the OEM option. It's nice to have the 2s delay for group shots that would want to be a part of. I use this problem free with my Sony NEX-7...Note: It's not obvious on the NEX-7 but you have the change the shooting mode to "Remote" in order to be able to use the remote.
Answer: 2032 size.