Unfortunately, their neckband isn’t the most durable and the rubber sleeve that protects the inner components tends to peel apart with time. Consider the Jabra Elite 65e Wireless as a better-built yet cheaper option with superior mic performance and more customization options, but they don’t sound as well-balanced and their battery doesn’t last as long. All things considered, the Bose still perform quite well overall and are good travel headphones.
This is the spec that tells you the range of sound that the product is capable of producing measured in Hertz (Hz). If you look on the box of any audio product this number is usually around 20Hz – 20,000Hz, with the first number representing the lowest frequency and the second representing the highest. This number varies depending on the product, but for reference, humans can only hear between 20Hz – 20,000Hz which is why that’s the range most products aim for.
That said, the term earbuds has become synonymous with earphones and in-ear headphones, so the difference is ultimately academic. Whatever you call them and whatever they say on the box, you should look for earphones that form a good seal inside your ear with silicone or foam eartips. They'll sound much better than plastic-covered drivers cupped against your ear canal.