I got these beauties yesterday. I bought some for myself in a shop and liked them so much I searched some out online for my husband - he loves them! Instead of using a standard straight jack like almost every other headphone, this uses and L-shaped jack which has such little clearance that every time the jack spins around or moves, it catches onto the case and pops off. I highly recommend going with this headset. These flipflops still have that wonderful arch support, comfortable toe thong. and it cant be difficult putting the clamp down and actually locking this system Not primary. There was none in the package After driving me crazy for a few weeks with slow benchmarks and bad latency I inspected the chips thinking maybe one had gotten swapped or just wasnt right. We purchased these for our 2013 Toyota Rav4.