They are not designed to be used in such a way. The earbuds will connect to each other when in close proximity and out of the charging case. You can, however, use one earbud on its own, and you can pair the earbuds to multiple devices. Thus, theoretically, you could habitually use one earbud for one device, and the other earbud for a different device. But, as I said above, if they are out of the case at the same time, and in close proximity, they will connect with each other and be useable with only one device at a time. If you need the functionality you are asking about, you should purchase a different product.