1-Alkyn-3-ol compounds of the formula: where R1 is a saturated aliphatic hydrocarbon group containing from 1 to about 12 carbon atoms, and R2 is a hydrogen, are effective attractants for mosquitoes. Groups of individual air cells can be interconnected and in fluid cooperation with an inflation source, such as a pump. In a first timing phase, the input pulse width is stored as a voltage on the timing capacitor. A firmware error handling routine is stored on the non volatile memory.