I have purchased 2 of these at different times to use in my classroom. They were very affordable. Both of them have had issues with the battery not making a good connection. There was nothing wrong with the batteries. I was able to get them to work after rigging the battery compartment. I don't feel these were well designed.
September 16, 2013
Ok, but does not work on computer screen
The battery compartment has sharp edges and cut my hand, its a low end product, I bought it to use on my new 27 I Mac, but the computer screen eats up the red light, so its useless to me.
Actually I would recommend buying something else.
It does work, but its not much.
May 25, 2013
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Thank you, you will now be redirected to comparisons.