1. The case's independence. I listened to the headphones for an hour on the way to work, another hour after work, and then for a few hours at home, for a total of about four hours of music (the headphones are intended to last for eight hours, so they should theoretically be discharged by half). As a result, by the end of the day, the case is already flashing and almost on the floor. That is to say, it cannot endure the headphones' single, full charge from 0 to 100. It can only endure a maximum of 60%, which is annoying because you have to charge it every night and it takes a while to charge—I didn't keep track, but it must take at least 3–4 hours.
2. The headphones are enormous and protrude like antennae from the ears; for the first week, it was really strange to wear them, but gradually the ears grew accustomed to them. For people with tired ears, I suggest turning the earpiece more vertically in the one that tires out more. For instance, the earphone in my left ear is diagonal, but the one in my right ear is virtually vertical. I'm not sure why, but it's more comfortable.
3. Changing the volume from the word at all is inconvenient. To increase the volume, simply press the left earpiece's button once. To decrease it, however, you must hold the button down for an illogically long period of time while waiting for the sound to stop, as there is no audible indication of when the volume started to drop or by how much. As a result, they always stand at their tallest and adjust the phone's volume.
4. They nearly never lose contact with the phone, but the right (slave) earpiece is sometimes misplaced; this may be fixed by tilting the head or by re-establishing contact with the phone, and it typically occurs in public.
5. Microphones, as anticipated for the show, some will undoubtedly be heard better than with conventional headphones, as they stick out loudly from the ears, but it's still simpler to pick up the phone and chat normally.
6. The most basic case is composed of matte rough plastic that looks cheap and has no functionalities at all, including no charge indicator or lid magnets. At least it's carefully put together and has a Type C connector, but for that money, it might have been made to seem more upscale and include a standard battery.