I highly recommend getting a two-pack?the clever, modular design really shines when you have more of them to play with. Unable to provide a review, returned because they didnt fit If this was the case, the manufacturer must have fixed the problem, because the unit I received is perfectly fine. I dont usually like wearing in-ear headphones but these are comfortable for me for an few hours. Fits well feels good I reordered this product explaining what was missing from my order and Amazon sent ANOTHER incomplete order! Overall I like it a lot and recommend it to those who are looking for an "easy to use" wireless earbud but doesnt care so much about "super" sound quality. It does have a strong smell when you first take it out of the box, I opened mine up and removed the plastic and stretched it out in the sun for a few hours and most of the smell is gone. A 5/16 drill bit and a few adjustments later its up. 5MM jacks.