[4-in-1; More Powerful] Our Repeller has 4 modes for effectively repelling indoor and outdoor pests like mice, mouses, ants, mosquitoes, spiders, cockroaches etc. This insect repellent is a perfect substitute for drugs and traps. [Intelligent Dual-Wave] Innovative Frequency Conversion Technology, the frequencies of ultrasonic waves and electromagnetic waves are converted and coexisted and can effectively affect the neurological auditory system system, so pests and mice unable produce immunity to insect repellents. [Safe ; Eco-friendly] The ultrasonic mosquitoes repellent repels pest totally depending on physical way and has no harm to humans and pets, no noise, no radiation, and pregnant women and babies can use it with confidence. It is cheaper and more durable than expensive pest control companies and other pest control methods. [ OLED Display ; Energy Saving] The OLED screen make it easy to read the current Pest Repeller modes, We use the latest technology, this repeller is more energy efficient, consumes less power, and is more durable, so you can reuse them for years. [Plug and Play ; Full Coverage] You can simply plug an electronic pest controller into a wall outlet without any tools. Ultrasonic insect repellen is effective in the range of 1100-1300 square feet. plug style: US plug Quantity delivered: 2 pieces Product color: black Product size: 95*61mm