"A disposable audio tool, priced appropriately for when function matters but quality does not."
A '40mm stereo driver' is a standard component size, not a mark of quality. In a sub-$10 headphone, it means the unit can produce basic stereo sound, not that it will have any notable fidelity, bass response, or clarity.
This product is for situations where headphones are treated as consumables. It serves as a 'burner' pair for young children, a bulk purchase for a school computer lab, or an emergency travel backup you would not be upset to lose.
Anyone seeking even moderate audio fidelity for music should skip this. Users who need a durable daily driver will find this breaks quickly. Individuals sensitive to clamping force will find the on-ear design uncomfortable.