Organometallic aluminum compounds of the general formula . The universal hub and strut system disclosed herein allows a geodesic structure to be more quickly assembled and with increased integrity. The air pump provides a collapsible air chamber collapsed from an expanded volume to a compressed volume to expel air from the collapsible air chamber into the mixing chamber. During the standby mode, the power source transistor causes reverse biasing of at least one of the one or more logic transistors which prevents a leakage electric current flow between the power source transistor and the one or more logic transistors.