This is a Genuine BMW Brake Fluid Reservoir with Sensor and Cup.
This is a Good Used item, see photo.
OEM Part number:
34528747978 / 118162 / 03.3558-4051.2 / 03.3508-9208.1 / 03.3508-9209.1
Fits:
BMW i4' G26 - and maybe other Cars, check with the part number.