Effective: This ultrasonic repellent is effective in indoor areas. For good results, one room and one drive are recommended. Because ultrasonic waves cannot penetrate walls and solid objects EASY TO USE: Just plug this indoor flight trap into an outlet and it works, the ultrasonic repeller should be installed 10-50 inches from the floor and perpendicular to the floor Environmentally Safe: This repellent is safer than traditional insect repellents instead of harmful and dangerous chemical poisons. Humans and household pets cannot hear ultrasound Clean the environment: very effective in controlling pests, keeping pests away from your home or office, no more insect carcasses around in the morning Working time: Unlike chemical sprayers, electronic repellents do not work immediately, usually 3-4 weeks depending on the number of pest infestations Package includes: 1 insect repellent Specification: Material: ABS Size: as shown Net weight: 100g notes: Due to manual measurement, please allow 1-2 cm error. Due to differences between different monitors, pictures may not reflect the actual color of the item.