Had it for a few days and have not charged it yet. I bought the same sized slipper 5 years ago (3922, size 11) and they fit perfectly. I like this product and Im happy with the purchase. Was könnte besser sein bzw. The construction is robust with a metal case on the adapter piece and around the USB C plug shell. Its the perfect length for use in the front seat. It took many hrs & moments of frustration, (thank God for YouTube! It is an amazing item to wear as a top layer as protection from rain or wind, but keep in mind it is thin and lightweight so not meant to keep you cozy and warm. The FebSmart cards with the Atheros chipsets gave me slow speeds on the default settings and require more attention to the settings. Transparency Mode:I really like this feature.