SereneLife PSLUMR8 Electronic Plug in Pest Repeller Repeller-2018 Upgraded High Frequency Ultras ULTRASONIC FREQUENCY: The SereneLife Electronic Pest Control delivers up to 20kHz ultrasonic wave that emits high frequency sound to effectively repel mosquitoes. Imitates the sound of male mosquitoes and dragonfly to drive all types of mosquitoes ECO-FRIENDLY: The mosquito trap offers you an eco friendly and humane way of eliminating mosquitoes inside your house without the need for harmful toxic chemicals. Safe, non-poisonous, and reliable. Perfect for indoor, home or office use PLUG-IN OPERATION: Just simply plug it into a wall socket about 1-1.5m above the floor. Switch between mosquito I, mosquito II and dragonfly sounds. It will then emit ultrasonic waves to repel pests. Use continuously for 7-10 days for desired results LED INDICATOR LIGHT: The repeller has built-in LED indicator lights to notify you that the device is working. The green light will be activated when switched to mosquito I, red light when on mosquito II and both LED lights up on dragonfly mode 500 SQ FT COVERAGE: This pest eliminator device has a coverage area of up to 500+ square feet ensuring your home and familys protection from mosquitoes and the diseases it may bring. Features a compact design w/ engineered ABS housing construction