Safe for Humans Ultrasonic Pest Repeller, Non-toxic Environment Friendly Electronic Pest Control Against Mosquitoes Ants Spiders & other Insects(White) (White Type 1) PROTECT YOUR HOME: Protect your home from annoying pests. Works for rats, mosquitoes, ants, spiders, bugs, mice, roaches and more. SUPER EASY TO USE: Selet the working frequency and plug it in outlets. If you want to protect large space buy a couple and create a barrier. ENVIRONMENT FRIENDLY: It is continuous ultrasonic and electromagnetic. Only rodents and other critters can hear not humans or dogs. ULTRASONIC TECHNOLOGY: Pest repeller adopts ultrasonic technology which targets the pests' sensitive auditory system, making them uncomfortable living in your home. 7 Variable wave technology to ensure pests don't become immune to the frequencies that are sent out