TriaIs of metofluthrin-impregnated multilayer paper strips against mosquitoes in shelters withno walls were carried out at 3 sites in Lombok, Indonesia. Major reductions in human biting by Culex quinquefasciatus,Anopheles balabacensis, and An. sundaicus were achieved. The device is a very practical measureof preventing outdoor mosquito biting, with no need for electricity or heating to evaporate its active ingredient.