Although this one has a smaller housing so it fits my xm3 a little too tight. 75u and high in size keys have these break away bumps on the bottom of the cap. (Due to the long wire, and audio splitter) So I was in a game one time, and I went to go get water, and they fell onto my chair, No big deal, it happens all the time. There are certain frequencies these headphones wont like but anything between 25k/30k-60k hz sounds amazing. Would?ve given these 5 stars in a heartbeat since I have ordered several letters and wear them all the time but the letter S for some reason came in different packaging and looks a lil smaller than the others I have. Recomendaría mejor hacer los orificios en la bicicleta y montar uno que realmente quede fijo. I love the lulu crossover I own several pair. I will look elsewhere for my next pair. Also, there is a hologram of the sun logo on it, however, it is placed in the middle of the tag rather than at the bottom. You dont need the app to use those features.