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

Input:
Question: Does it work on glass ?
Document: I am using the laser keyboard to type this right now. I am using a sheet of paper on a glass desk, not as accurate on glass, but can be used.
The celluon keyboard did not work at al. I would like to return it to receive my money back. Very disappointed.
Work good on flat surface. Good brightness . Good looking gadget.Not to expensive. Overall new technology in your hands for little more than 125$.
I love using this so much. It has a mode to make the typing a lot more sensitive to the typing. If I have long fingernail it obscures the laser and the  typing doesn't work as well but I still love this device.
The Epic, unfortunately, was not designed to be used on a PC other than as a mouse. In any case, I could not get it to work on my computer, despite the fact it has a bluetooth connection with the latest drivers.The keyboard requires a bit of a learning curve, apparently, in order to be able to type with any kind of reasonable speed.
I originally wrote a horrible review for this product as it did not work on my phone running 4.3 or on my tablet running 4.2.1. I contacted a customer service rep here in the USA about it. Could not have been more pleased with the communication and help they have given me. Apparently they were not aware of the problem I was having on my androids. I was the first to tell them of my problem which is why I couldn't find a fix for it on their websites.
OK. So an update. I previously was "disappointed" in this, as it didn't work at all with my Android 4.3 Nexus 2nd gen tablet. Android 4.4 came out and has fixed this issue. So, I'll give it 4 stars now. It still is a bit finicky w/ finger placement, and I'd like to be able to decrease the volume even more (it can be silent or with a varying volume of beeps w/ each keystroke).
works ok not good for want i needed locks up  runs out of battery fast looks great ok if text a lot
very impressive technology. im proud to have played around with it, but they have to improve the typing speed or its just a toy.
it is ok , but be careful any interact/ cross with the ray could type irregular letters, even if you did not tough the keyboard letter itself.
Answer: Yes, but it can be iffy.