Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy this device

The Superpointer SP-100 is not workable. It does not have a feature to bland the screen (every remote slide advancer/pointer I've every used in the past has that feature) and I never got the SP-100 to work at all. It came without a battery and it turns out that there are not instructions on what battery to use--not on the box and not in the instruction bookelt. I purchased a 2N battery becasue it looked like it would fit in teh battery compartment--but it didn't! The item is very cheap but it should at least work. It was not worth returning, and my advice is never every purchase this device or any made by the same compnay!