Keeps Unwanted Animals AwayRats, mice, squirrels and other destructive rodents often shelter under the hood of vehicles and damage wiring harnesses, cables and other expensive parts. Loraffe Battery Operated LED Rodent Strobe Light and Ultrasound Device emits ultrasounds to cause their intense auditory stress and flashing lights to target their eyesight, creating a hostile environment for rodents to live and forcing them to move on and escape from the area. How It WorksIt works in cycles. In each cycle, ultrasounds and LED Flashlights will be emitted alternatively or simultaneously. The sound frequency will constantly change so that rodents don't get used to the same sound being produced. *The ultrasound frequencies, higher than the upper audible limit of human hearing, are silent to human ear. CoverageThe ultrasound waves radiate in all directions, covering approximately 16 feet in radius.  It is recommended to apply 2 or more units to alternate the operation cycles and overlap the coverage area if rodent activity is high. Where to UseThe wireless connection allows you to place it almost everywhere such as garage, attic, basement or easily mount it within car, tractor, boat without connecting to the vehicle's electrical system. Energy SavingAuto standby to save battery power while driving; Automatically resume work 20 seconds after car parked. Low Power AlarmWhen battery voltage drops below 3. 3 volts, the device will beep twice every 5 seconds to remind you that the batteries should be replaced. Technical SpecificationsPower Supply: 3* AA batteriesUltrasound Frequencies: Varying between 25 KHz - 55 KHzLights: Dual LED strobesProduct Size: 3. 94*3. 15*1. 02 in.  Package Includes1* Product (Batteries Not Included)1* User's Manual1* screwdriver8* Zip Ties