The ultrasonic pest repeller Features Include: Continuous or Motion Sensor Activated 5ft to 150ft Motion Sensor Range 5000 sq ft Sound Distance Exclusive Keychain Remote (up to 75 ft) Safe and Humane Select a Pest Technology Strobe Light Adjustable Sensor Sensitivity Weather Resistant Battery or AC Powered 110v AC or 220v AC Adaptor included How it Works: Using a motion-sensitive sensor to detect anything from a scurrying opossum to a fluttering bat, The Guardian Advanced sends out a range of sonic and ultrasonic (inaudible to humans) frequencies that frighten away a large variety of pests. The Guardian Advanced emits sound pitches specific to different animals, allowing you to repel a wide variety of pestsSafety: Unlike some pest controls that use dangerous, sometimes poisonous means of ridding pests, The Guardian Advanced uses ultrasonic sound frequencies that are slightly audible to humans to scare away animals and insects. The Guardian Advanced is a humane option to fixing your pest problems and includes features such as a strobe light and intrusive sonic blasts to warn away prowlers. Say goodbye to rat poison, harmful chemicals or worrying about your children and petsSound Sweep and Select a Pest Technology: Our Select A Pest technology gives you the means of setting The Guardian Advanced for a particular pest. Get rid of that ticking stink bomb of a skunk under your deck without sending your pet bird into a frenzy. Weve gone even one step further with our revolutionary Sound Sweep technology and incorporated fluctuating noise frequencies that target pests with the most pest-repelling frequency. These two features combined make The Guardian Advanced unparalleled in repelling power.