I was really disappointed with this product, the box looks like assembled from cheap material, loose cable inside not well concealed, the strap belt clip broke at first use, as it wouldnt support the battery weight if you try to pick it up by the handle, this is a major design flaw, as you would instinctively pickup the box by these. I bought these to replace a pair of more expensive Quicksilver Oasis that had glue failure in just a few months. 2 stars out of 5 I leave because they are still very comfortable. LOOSE fitting especially at the upper leg (my legs are 23"). ) I?m using it with headphones to a Casio wk225 keyboard. That straps main purpose is to make sure the baby seat doesnt recline too much --- the baby seat is still securely attached to the bike (thankfully), so its not like the seat fell off the bike or any harm came to my daughter. Came with the rack that holds the seat (many sell separately. These are not $10 discount headphones, nor are they studio quality monitors. Very pretty & delicate. I ended up finding some cap screws from my own stash to use.