Keeps away mosquitoes using Silverline A-guard sound technology; no poisons needed. Keeps your home free from biting female mosquitoes using the sound technology behind the advanced Silverline A-guard. Specially adapted sound frequencies cause the mosquitoes to leave the area, without killing them. The sound does not affect pets or humans, but may be audible. Does not create resistance among the targeted pests. Has a range of up to 1m² and is powered by batteries.