Bought these to deaden the sound a bit in my work environment, air tools for automatic disassembly. While they don't fit snugly around the headphones like a jib, they block out just enough noise to keep your ears from ringing at the end of the day. I can still hear colleagues and cars. They're a little fiddly to charge, but I found that if the ear hooks press against the case's top cap when closing, they should stay in place. They're not as comfortable as jib earbuds, but they don't slip out of your ears like a jib.
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