5G/ 4G to real LTE. I hate buying shoes online but these fit absolutely true to size. I always order a half size up because Id rather have my shoes be too big than too small and most of the time, a 7 and a half is not available. Extremely comfortable and they do not crumble in your hand if you try to remove them from your Air pod Pros like one brand that I purchased did. They got dirty and worn looking quickly the first time around so Im going to be more precise with her usage in these. Not that big of deal except for the fact it makes a very audible "squeak" that your friends can hear as well. Love them and great to use you just have to download the app to pare with your phone. I would like to have it ready to reference. No one could ever touch 96 Deathrow at it finest. Waste of good IEMs not to use comply to get the best out of them.