The screwdriver that came with the replacement set is a standard tiny phillips style. Needed a last minute pair of nude heels for a wedding. They stay plugged in well and unlike the old style power taps they do not seem to work their way out of the socket so easily. The surrounding cabinet is minimal and as a result, this unit is small enough to place just about anywhere. The strap around the ankle has enough given flexibility that whether or not you have skinny ankles or a little bit thicker ankles it will definitely work with you. I only wore them for a few hours that day. Took them a week to respond. I’ve worn Birkenstock since the 60s. Auf jeden Fall auch eine nette Funktion, von der ich aber im Vorhinein so gut wie kaum was wusste und somit nicht zu meiner Kaufentscheidung beigetragen hat. its super light too which is perfect