An optical film with super low retardation, including metal oxide nano-particles dispersed in a transparent resin having a three-dimensional crosslinking structure. The biphenyl derivatives of this invention possess both \u03b22 adrenergic receptor agonist and muscarinic receptor antagonist activity and therefore, such biphenyl derivatives are useful for treating pulmonary disorders, such as chronic obstructive pulmonary disease and asthma. The interposer is configured to selectively couple at least one of the first plurality of electrical connectors to at least one of the second plurality of electrical connectors. The second section in a first position covers and substantially seals the first section and in a second position allows air to pass through a space between the first section and the second section and deliver the fragrance material to the atmosphere exterior to the air freshener unit. The holder is configured to receive an item to aid the individual in everyday tasks.