Jerome Russell BBlonde Maximum Blonding Kit No.2 for blonde to medium brown hair is a complete kit for lightening your hair by up to 6 or 7 shades and does not need any other product to be used.
There are a few additional items you will need, and these are as follows:
Timer or watch.
Cotton wool buds.
Old towel to protect skin, clothing and surfaces.
It's designed for use on light brown to light blonde hair; if your hair is darker than this you should consider using the BBlonde Maximum Blonding Kit No.1, also available from Allcures.