GreenStrike Mosquito Preventer Featuring Zero Hatch Technology, Black Simulates an artifical pond to attract the female mosquitoes to lay their eggs. The Preventer automatically flushes the eggs every three days and are trapped in the filter to prevent hatching. The Mosquitoes natural attractants and GreenStrike Patented Mosquito Lures are recycled back into the artificial pond, ready to capture more mosquitoes eggs. Target and reduce mosquito populations that can transmit: West Nile Virus, Yellow Fever, Dengue Fever, Chikungunya Item Ships with 8 AA Batteries This is an OEM part