I have one on my T1, and one on my T2. Both basically the same and interchangeable. It takes a AAA battery and is adjustable. You turn it on by lifting the light out of it's casing, turn it off by returning it.
I like them. The light is nice and you can cover the whole screen. Sometimes it's a bit of a glare if you have a shiny machine. Works for me.
For me, I like that it doesn't take it's power from the machine itself. We had power out for a couple of days after a storm, and it was easier to find a battery than it would have been trying to find a power source to charge the machine itself. I read a lot, made it through fine.
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