Fangrui Product Details Mosquito Repellents Type: Ultrasonic Insect Repellent. Audio Frequency: 15 ~ 95khz. Effective Range: 10-60 Square Meters. Material: Abs. Charging Method: Usb Charging (supports Fast Charging). Mosquito Repellents Are Ideal For Controlling Pests Without Chemicals And Can Be Used Safely In Any Indoor Environment Covered By Parasites. Ultrasonic Pest Repeller : 13-75 Khz, 7-band Continuous Loop Scan, Can Cause Mice, Mosquitoes And Most Other Pests, Effectively Repel Mosquitoes, Mice, Worms, Mice, Spiders, Cockroaches, Ants Etc. Convenient For Outdoor And Indoor Use, Such As Home, Bedroom, Living Room, Kitchen, Office, Warehouse, Hotel, Outdoor Activities, Especially For Camping, Hunting, Mountaineering, Running, Hiking And So On. Wide Effective Coverage : The Pest Control Can Be Widely Used In Households, Warehouses, Shops, Hotels, Hospitals, Offices, Cereal Warehouses, Etc. With A Coverage Of 10-60 Square Meters.