★Ultrasonic Technology: Ultrasonic creates an uncomfortable environment for pests to create a giant pest repelling field. Reaches deep into walls and cracks untouched by other pest controls where 90% of pests nest and breed ★Safety:designed to repel pests, mosquitoes, mice, ants, spiders, roaches etc, by emitting various soundwaves, and driving them crazy without any damage to human beings, It has zero odor and is totally inaudible to humans ★Extra USB charging function & Night Light:allows you to plug in additional small electronic devices. The built-in blue LED night light is with on/off switch ★Easy to Use: Just plug it into an outlet, it starts working,easy to carry,no need to clean up dead insects and rodents,as it naturally drives pests out without killing them ★Wide Coverage:Coverage area up to 1100 sq ft. More than enough for your home, garden, or backyard. Recommended to install one device in each infected room for best results, since ultrasonic waves cannot penetrate walls. if you have a serious infestation, it is best to place one unit in each room.