Just compresses it a little bit. Once your phone reaches 100% the charger cuts off. This is just my complaint and experience, anyways thank you for reading and have a good one. Its full of anticipation. Sie sind super bequem und luftig. I have quite a few in different colors. 10/24/20 Update: Because of Covid I had no worn them. My PC Setup:AMD Ryzen 7 1700xMSI X370 GAMING PLUSMSI GTX 1050 Ti 4GB (white model)CoolerMaster Liquid Lite 120MM (water cooler) + Thermal Grizzly Kryonaut Thermal PasteBitfenix Colossus Window The hole the stem goes in doesn?t fit. ) for my 10+ shoes I have bought since my first order!