BUT: the previous model (! Same model number) was the volume on the headphones set. Depending on the application, for example, school computers, the primary school child now must adjust the volume on the computer, this can be harmful not on the headset itself. And if that is not possible depending on the device, even to 85db and uncomfortable in the long run.
Why Philips now changes a model under the same name, I wanted to know from the support. Here you have but referred only impertinent that Philips had the right to be produced a product with the same model number or other missing features. I see it a little differently, and some major customer should also not be thrilled, because it creates confusion that a model is advertised with volume locking (Amazon has already properly advertised), the then yet does not exist, however.
For such questionable business practices Philips should be ashamed - a large corporation is not worthy. I will remember in the next product purchases in any case.
As a rule, good headphones (when the volume as its predecessor under the same model number in addition to the child-friendly volume reduction would be set), but that only two stars.