membrane air freshener 1,Detach the aluminum cover 2,To place the product on any surface bend front flap out slightly to prop unit open and put on a flat dry surface. 3,Then hang it from a hook using hang hole at top or tie a string through the hole to hang it from a hook. 4, When the fragrance vanishes or the product starts looking dry,throw the gancho. 5,lasts up to 30days.