Theyre not as straight forward a fit as the apple airpods where theres one size and one way to wear them. I should have paid closer attention to the many negitive reviews. The heel is narrowed at the base and you def feel it when its on. Battery life is great as well, very happy with this purchase. Mid-base through the vocal range is where this speaker shines. Cada agudo ??????Volume no máximo sem perda de qualidade! I can only surmise that protection is offered either by transformer saturation or actual transformer wire blowout, which would open the transformer and stop all signal from flowing. Speed on phone charge is mediocre. Left the case for my Sony WH-1000XM3 on an airplane and immediately ordered this case. I expected shipping to be cutting it close to game day, so I sent an email asking for them to ship asap.