Flying insects are attracted to the light in the unit and are killed by the charged grids which surround the light This Ultra 40 watt electronic bug zapper is ideal for medium sized yards up to 1 acre in size.. This 15 watt electronic bug zapper is ideal for smaller yards up to 1/2 acre in size. Flying insects are attracted to the light in the unit and are killed stinger 1/2 acre flat panel insect killer by the charged grids which surround the light. Stinger 1.5 acre outdoor insect killer max Flying insects are attracted to the light in the unit and are killed by the charged grids which surround the light This 80 watt electronic bug zapper is ideal for large yards up to 1 1/2 acres in size. This 40 watt electronic bug zapper is ideal for medium sized yards up to 1 acre in size. It uses a ultraviolet black light bulb to attract up to 40% more insects than white light bulbs. A new Sundown Sensor protec stinger 1 acre outdoor insect killer allows you to choose "dusk to dawn" or "24 7" operation.