I remember that was easy rule to follow as a child. The battery gauge is really neat too so I can tell when theyll need charging. I didnt search for these because people told me they were the most comfortable pair out. So I am down to 3 pair of BT phones, with one on order (Earfun Free Pro with special tuning). Blessings to the team that created these-I love them! I loved my old pair more. Super I recommend UPDATE - Found some memory foam tips from a company that said they should fit the Hauwei Pros, I tried and they fit. I honestly think they were not authentic keds . You can have it a bit off your ear and still hear the On/Off announcement it makes.