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

Input:
Question: How many computers can you install this on? I have 2 desktops and 1 laptop. Can it only be installed on one device? Does it work on televisions too?
Document: A bit disappointed. It worked on two of my computers and then it stopped working when trying to install on another two. One a laptop and one is a new build computer with led monitors. When trying to calibrate on led monitors it freezes and then crashed. So never can I clalibrate. I think they don't work on led monitors.
I needed my displays calibrated before I sent some of my work to print and was really undecided between the ColorMunki Display and the Spyder4 Pro. I did a LOT of research online trying to pit one against the other but there wasn't any real comparison available. I finally ordered the ColorMunki Display primarily because of 3 reasons:1. It wasn't clear whether the Spyder4Pro supports multiple computers. The product description says that it supports multiple displays but nothing is mentioned about multiple computers.2.
I have a Dell Desktop with an regular Dell monitor(1), and a Dell laptop that is sometimes hooked up to a different Dell monitor (2). I  installed and read all the instructions and watched a few youtube videos describing the process. I tested the product on my Dell Laptop and the Dell monitor (2). I followed the video instructions, and went with Easy adjustments.
Note, all my testing is with Windows 7 64bit and Vista 32bit computers, I don't know how the ColorMunkey would work on a Mac or older versions of Windows.Problem 1:  For some displays I've had to calibrate twice to get the right colors. Not common but it has happened to me. If the colors don't look right try again. I suspect this to be a Windows issue (I suspect the latest patch will fix this).Problem 2: It works better when Windows has drivers for the monitor.
Others have complained about the poor colors or other issues from this calibration device. I have had no issue. Installation was initially a bit challenging and so I chose to install the latest firmware from the web (1.0.2 as of this writing). This seemed to massively simplify the process and was better than the version on the CD.In general, the use is very straightforward with a wizard based approach to initially calibrating your monitor.
I have 2 Auria 27&#34; 2560x1440 monitors that I love but never could get the colors to match each other with the Spyder 4 Pro from Datacolor used it many many times and no luck at all. Just finished using the ColorMunki and calibrated both monitors faster than the Spyder did 1 monitor and the best part I cant tell the difference in color between the monitors now! Thank you ColorMunki!! !
I followed directions very very carefully on 3 separate computers (2 macs and 1 windows). I used the quick and the advanced settings to see if there is a difference. I went to their website and used the updated software.Every computer and monitor (including a classroom projector) I used it on turned all the greys and blacks into browns. And if I try to watch a movie with dark scenes, everything was dark brown and I couldn't tell anything. I can't imagine it being accurate at all.
I really like the fact that ColorMunki supports multiple monitors and multiple computers. The competition artificially restrict their device to a single monitor and you have to un-install the software and re-install it on another computer before it can be used there... dumb business decision.
Another reviewer said that the hardware is really the same as i1Display Pro which comes highly recommended.Now about the product. The hardware is really sleek and sits comfortably on the screen without scratching it. I did not install the software from the CD that came with the product, I installed the latest version from Xrite website. There is a prompt for registering the software but it's not mandatory and I recommend skipping it until you're sure that you're not returning the product. It can automatically identify if you've more than one displays.
It seems to solve several problems with the program not responding. This component (the XRD Manager) gets installed by the X-Rite drivers but this component got a separate update.Go to the X-Rite site and search for "X-Rite Device Services (XRD)", the latest version as of today is 2.2. Below are a list of issues (rare issues) I have encountered with ColorMunki but I don't know if this update would solve any, some or all of them.
Answer: Best I can tell, there's no restriction on number of computers you can install it on.  Just keep your serial number.  As for televisions, I don't know how you would use it on one, since you need software to operate it.