These are Bose QuietComfort Earbuds Ⅱ. Both earbuds are present, so a new connection is possible. Of course, they are genuine, so they can be linked with the app. The left earbud plays the startup sound, but it cannot connect. However, you cannot make a new Bluetooth connection without the left earbud, so please be careful not to lose it. These are recommended for those who are okay with just the right earbud. Other functions work without any problems.