Double Ultrasonic Speaker: The ultrasonic bat repeller uses adjustable high or low frequency sound waves to deter bats or other birds effectively. This device provides a humane solution to protect your home from unwanted flying visitors Friendly to Humans & Pets: Just ultrasonic frequencies that disrupt bat or other birds communication and navigation. This humane and effective method keeps your space bat-free without endangering human, pet or wildlife USB Rechargeable & Portable:This bat repellent is USB rechargeable, making it perfect for indoor and outdoor use-whether in your home porch balcony garden or orchard. Maintenance-free, day and night protection for your home and property Easy to Use: After bat repellent outdoor is fully , the switch to activate the ultrasonic wave and indicator light be on. If the product effect is not ideal, you can adjust the sound wave to achieve a more ideal repellent effect Quiet Operation: The Ultrasonic Bat Repeller works silently, ensuring your peace and quiet while maintaining bat control. Unlike noisy deterrents, it operates in the background without disturbing your home environment Wide Coverage Area: Designed to cover large spaces, this repeller protects up to 2,000 sq. ft. Ideal for attics, garages, barns, and other areas where bats may invade, ensuring complete bat prevention throughout your property Color: White Material: plastic Package Contents: 4 * bird repellent devices Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.