Portable Ultrasonic Insect Repeller DeviceOverview: [Latest chip technology] This indoor accessory emits invisible electromagnetic waves to repel insects, mice, mice, mosquitoes, ants, spiders, cockroaches and other insects. No need to kill them. The ultrasonic repellent will work within 3~4 weeks according to the number of infections, so please pay attention. Then we can say goodbye to pests and rats. [More comfortable for children and pets] Throw away the harmful poisons, hazardous