Multifunctional, can be used for travel or in toilet or can be used as makeup bag. Unfortunately they seem to get lost easily so Id recommend buying a pack of spares (which are only about £1-2). I use them in the front posts for squats and overhead press. All in all, it took me 48 minutes to fully install and get operational. I love that they easily brush off and dont seem to attract any shredded dog hair. No nonsense involving psychoacoustic "3D surround sound" nonsense, no bullshit features or unnecessary design - this is a simple 2x2 USB audio interface, and its very well engineered. Shoes the shoes run a 1/2 size bigger then expected. I hope my review helps in some small way. Super easy pairing using Bose Music app on phone. Got L size and it fits very well.