Retractable barrier, flap barrier, retractable flap barrier series, made up of two or more machine bodies which through ther sliding movement of permanent crystals allows the opening and closing of the passage. It has standard electrical interface which can be connected with ID cards, IC cards, magnetic cards, barcode cards etc. Retractable barrier, flap barrier, retractable flap barrier series, extremely suitable for controlled padestrian movement in big corporation, parks, metro stations etc.