If you use earbuds to listen to music, you probably have them with you but not necessarily wearing them all the time. You may need to take them out to interact with another person or when you want a break from listening to your music. When that happens, you have to solve the problem of where to put those earphones. Props solves that problem for you.
Props is essentially a string with two grips on each end that you wear around your neck. Your earbuds then attach to the grips and are held in place when not in use. If you want to put them on, Props adjusts so it doesn't get in the way while still holding on to your headphones. My product-free solution has always been to toss my earbuds around the back of my neck so they'd stay put, but they'd sometimes fall off and end up tangled. Props looks like a more elegant solution to the problem, if you're willing to pay a small fee.
Props ($US6) [Quirky]