whats the difference between this and black electrical tape?

I can't answer for these stickers but I have been using black electrical tape for years. It 8a cheaper and blocks 100% of led lights. Granted you don't get neat round stickers with electrical tape but with a sharp knife or box cutter you can cut pretty much any size you need.

Are these reusable? What I mean is, is the glue really tacky or more like a post-it note? Thanks!

The glue is really tacky, much better than a post note. However they are not reusable. If you need to reuse them I recommend buying in bulk from the direct website. There are significant price drops.

do these still allow IR signal through?

No, but our LightDims Original strength does, so it should help with your problem and allow you to still have IR if your asking because you want IR transmission. Here is a link below to our products which allow IR. https://www.amazon.com/dp/B009WSJNCW?ref=myi_title_dp or https://www.amazon.com/dp/B009WTOGFK?ref=myi_title_dp or https://www.amazon.com/dp/B01DX1IW2U?ref=myi_title_dp

Product Dimensions	0.02 x 10.4 x 25 cm; 2.83 g
Item Weight	0.1 Ounces
Finish types	Matte
Number of pieces	100
Batteries required	No
Import designation	Made in USA

LightDims

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