... does not use any chemical substances, can be widely used in home, apartment, warehouse, hotels, supermarket, garages, office, ... it does not interfere with electrical or electronic equipment.3. It is not only repel spiders away, but ... coverage, it is recommened to use a device in every room or enclosed area.7. When you ... : 39480PCS 40FT' : 80340PCS 40HQ:94200PCS Indoor ultrasonic 3 in 1 spider repeller