Abstract: A portable, light-activated, mist sprayer system comprising direct current power supply, a container of treating fluid at a desired concentration; a motor and pump that are activated at the appropriate time as determined by the switch or timer; at least one sprayer nozzle that will dispense a mist containing the treating fluid whenever the pump is operating; and a timer that turns off the pump after a preset interval to terminate the spraying cycle. A preferred utility for the system of the invention is spraying dilute solutions of insecticide or insect repellent in a mobile fashion while in areas away from a power source or away from larger stored amounts of insecticides.