yes, these are outdated ASIC USB miners.
If you want some up to date search for GekkoScience 2pac or moonlander2 (for LTC mining)
Topic: Block erupters (Read 144 times)
How does a block erupters inner workings work?
I believe it is a USB mining "tool" which uses ASIC (
Quote
application-specific integrated circuit
), but it seems to me that these are highly outdated, and that making a profit with them is nearly impossible.Some more information about asics can be found here - > https://en.bitcoin.it/wiki/ASIC
Here's some of these "block erupters" you're talking about, https://www.cryptocoinsnews.com/block-erupter-usb-beginners-guide/
How does a block erupters inner workings work?
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