I've been using thse sleep buds every night for almost a year and now I can't sleep without them. I originally purchases these because my room backed up to a fairly busy road and the noise of cars going by kept me up all night and would wake me up if a large truck drove by. They work perfectly for that. I currently live with my boyfriend and he snores, probably at a medium volume, and they also work for that. I personally don't keep my volume loud enough to drown out all of his snoring, but it makes it manageable to where I can sleep. I could turn the volume up to completely drown out the noise if I needed to. (The app has an indicator to tell you where you might not be able to hear noises like fire alarms. It will let the buds play fairly loud, but it will tell you that you may not be able to hear outside noises you'd want to hear above a certain point. I've included a screenshot to further clarify)The case the sleep buds store in is also their charging case. A full charge will last about 4-5 nights of use, longer of they're not used daily. I've traveled with them and did not need to charge them. There are little indicator dots to show remaining battery life on the front inside of the case. When you connect the buds to your phone, it will display the battery life of the buds as well. The case uses a USB-C to charge. That's the same for my phone, so it's very convenient to charge my phone at night and charge the sleep buds' case during the day, but iPhone users will have to find outlet space for one more cable, just as a heads up.So these are not ear buds that play any music you want. They connect via Bluetooth and via the bose sleep app to your phone. You're phone is more of a remote for the sleep buds. You go to the app where you can sample their prefabricated white noise sounds, pick a few that you want stored on the actual ear buds, it uploads them to the ear buds, and then you can scroll through the app to play what sound you want that night/day. The purpose for all this is to ensure that the white noise and your first alarm will play if your phone dies. (You can have multiple alarms go off, but if your phone dies in the night, only the earliest one will sound) I'd recommend downloading the Bose sleep app before purchasing the sleep buds to sample the white noise selection if you were curious about what to expect.They do stay in your ears fairly well. They come with a small, medium, and large silicone sleve to fit most outer ears. I'm a side sleeper, and they sit flush in my ear and are comfortable against a pillow. I'm a very rough sleeper and toss and turn ALOT in the night. At first, the ear buds did fall out while sleeping and I had to search for them, but they were usually around my shoulder or under the pillow. Sometimes they'd be on the floor or further down in my sheets, but I think I was inserting them incorrectly because now they rarely fall out, almost never. But again, I sleep rough so don't be discouraged.I'd recommend this to anyone who has a partner who snores, or for a partner who sets an unholy amount of alarms in the morning (they can use the sleep buds and have all their alarms sound while not disturbing you). I also recommend for anyone whose a light sleeper and is disturbed by noise. And you don't have to use them at night, I use mine while reading books or when my room mates are being loud as well. I know they're kind of expensive but they've really helped me sleep better and longer so I think they're worth the splurge.My ONLY complaint, and it's a small one, is the color. They're very lovely, but they're off-white. When they do fall out of my ears and I'm looking for them in the middle of the night with my phone flashlight, they can be hard to find. My sheets and pillowcases are white though. I wish they had some reflective paint on them or were a bight color. Again, not a super big deal. I've never lost one, just a personal experience.